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If BE || CD, and BC = AB = 3, AE = 4 and CD = 10, what is [#permalink]
 04 Feb 2012, 18:48
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Trapezoid.GIF [ 1.77 KiB | Viewed 3811 times ]
If BE || CD, and BC = AB = 3, AE = 4 and CD = 10, what is the area of trapezoid BEDC? A. 12 B. 18 C. 24 D. 30 E. 48 I am struggling to solve this. What's the concept? I can think of area of similar triangles as what Bunuel has said previously.
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Re: Area of Trapezoid [#permalink]
04 Feb 2012, 18:54
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Attachment: 
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If BE || CD, and BC = AB = 3, AE = 4 and CD = 10, what is the area of trapezoid BEDC?A. 12 B. 18 C. 24 D. 30 E. 48 Triangles ABE and ACD are similar (they share the same angle CAD and also as BE is parallel to CD then angles by BE and CD are equal, so all 3 angles of these triangles are equal so they are similar triangles). Property of similar triangles: ratio of corresponding sides are the same: \frac{AB}{AC}=\frac{BE}{CD} --> \frac{3}{6}=\frac{BE}{10} --> BE=5 and AD=2AE=8. So in triangle ABE sides are AB=3, AE=4 and BE=5: we have 3-4-5 right triangle ABE (with right angle CAD, as hypotenuse is BE=5) and 6-8-10 right angle triangle ACD. Now, the area_{BEDC}=area_{ACD}-area_{ABE} --> area_{BEDC}=\frac{6*8}{2}-\frac{3*4}{2}=18. Answer: B. Also discussed here: trapezium-area-99966.htmlHope it helps.
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Re: If BE || CD, and BC = AB = 3, AE = 4 and CD = 10, what is [#permalink]
05 Feb 2012, 03:42
Since triangles ABE and ACD are similar we get BE = 5 and ED = 4
To determine the height --> 3^2 = h^2+a^2 and 4^2 = h^2+b^2
where a+b+5 = 10 so we get a+b= 5
putting this value in the above equation we get b-a = 7/5
From this value we determine the value of h =12/5
since area of trapezium = 1/2*ht*(sum of parallel sides) = 1/2*12/5*15 = 18
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Re: Area of Trapezoid [#permalink]
05 Feb 2012, 22:32
Bunuel wrote: Attachment: Trapezoid.GIF If BE || CD, and BC = AB = 3, AE = 4 and CD = 10, what is the area of trapezoid BEDC?A. 12 B. 18 C. 24 D. 30 E. 48 Triangles ABE and ACD are similar (they share the same angle CAD and also as BE is parallel to CD then angles by BE and CD are equal, so all 3 angles of these triangles are equal so they are similar triangles). Property of similar triangles: ratio of corresponding sides are the same: \frac{AB}{AC}=\frac{BE}{CD} --> \frac{3}{6}=\frac{BE}{10} --> BE=5 and AD=2AE=8. So in triangle ABE sides are AB=3, AE=4 and BE=5: we have 3-4-5 right triangle ABE (with right angle CAD, as hypotenuse is BE=5) and 6-8-10 right angle triangle ACD. Now, the area_{BEDC}=area_{ACD}-area_{ABE} --> area_{BEDC}=\frac{6*8}{2}-\frac{3*4}{2}=18. Answer: B. Also discussed here: trapezium-area-99966.htmlHope it helps. This is how I approached: Since BE is II to CD AND B is mid point of AC therefore BE is Midsegment which means that BE = 1/2 (CD) = 5 and AE = ED = 4, Observing triangle ACD : its a 6,8,10 Right Triangle & therefore area is 1/2(b/h) = 24 similarly traingle ABE : its a 3,4,5 triangle & therfore area is 1/2 (b/h) = 6 Therefore area of trapezoid is = 24 -6 = 18. Answer is B
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Re: If BE || CD, and BC = AB = 3, AE = 4 and CD = 10, what is [#permalink]
06 Feb 2012, 07:15
Similar triangles, area from ACD - area from ABE = target area
-->18 Answer B
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Re: If BE || CD, and BC = AB = 3, AE = 4 and CD = 10, what is [#permalink]
27 May 2012, 19:42
Quote: So in triangle ABE sides are AB=3, AE=4 and BE=5: we have 3-4-5 right triangle ABE (with right angle CAD, as hypotenuse is BE=5) and 6-8-10 right angle triangle ACD. Bunuel, any time we see a triangle with sides 3,4,5, can we assume its a right triangle?
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Re: If BE || CD, and BC = AB = 3, AE = 4 and CD = 10, what is [#permalink]
28 May 2012, 00:20
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pgmat wrote: Quote: So in triangle ABE sides are AB=3, AE=4 and BE=5: we have 3-4-5 right triangle ABE (with right angle CAD, as hypotenuse is BE=5) and 6-8-10 right angle triangle ACD. Bunuel, any time we see a triangle with sides 3,4,5, can we assume its a right triangle? Yes, any triangle whose sides are in the ratio 3:4:5 is a right triangle. Such triangles that have their sides in the ratio of whole numbers are called Pythagorean Triples. There are an infinite number of them, and this is just the smallest. If you multiply the sides by any number, the result will still be a right triangle whose sides are in the ratio 3:4:5. For example 6, 8, and 10.A Pythagorean triple consists of three positive integers a, b, and c, such that a^2 + b^2 = c^2. Such a triple is commonly written (a, b, c), and a well-known example is (3, 4, 5). If (a, b, c) is a Pythagorean triple, then so is (ka, kb, kc) for any positive integer k. For more on this check Triangles chapter of Math Book: math-triangles-87197.htmlHope it helps.
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Re: If BE || CD, and BC = AB = 3, AE = 4 and CD = 10, what is [#permalink]
31 May 2012, 07:20
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Bunuel wrote: pgmat wrote: Quote: So in triangle ABE sides are AB=3, AE=4 and BE=5: we have 3-4-5 right triangle ABE (with right angle CAD, as hypotenuse is BE=5) and 6-8-10 right angle triangle ACD. Bunuel, any time we see a triangle with sides 3,4,5, can we assume its a right triangle? Yes, any triangle whose sides are in the ratio 3:4:5 is a right triangle. Such triangles that have their sides in the ratio of whole numbers are called Pythagorean Triples. There are an infinite number of them, and this is just the smallest. If you multiply the sides by any number, the result will still be a right triangle whose sides are in the ratio 3:4:5. For example 6, 8, and 10.A Pythagorean triple consists of three positive integers a, b, and c, such that a^2 + b^2 = c^2. Such a triple is commonly written (a, b, c), and a well-known example is (3, 4, 5). If (a, b, c) is a Pythagorean triple, then so is (ka, kb, kc) for any positive integer k. For more on this check Triangles chapter of Math Book: math-triangles-87197.htmlHope it helps. But MGMAT says that if you see the 3-4-5 as the side ratio, it does not implies it is a rt angled triangle???
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Re: If BE || CD, and BC = AB = 3, AE = 4 and CD = 10, what is [#permalink]
31 May 2012, 07:28
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Re: If BE || CD, and BC = AB = 3, AE = 4 and CD = 10, what is [#permalink]
31 May 2012, 10:00
Bunuel wrote: manulath wrote:
But MGMAT says that if you see the 3-4-5 as the side ratio, it does not implies it is a rt angled triangle???
I doubt that. But if it does then it's a mistake. That's because converse of the Pythagorean theorem is also true.
For any triangle with sides a, b, c, if a^2 + b^2 = c^2, then the angle between a and b measures 90°.Since 3^2+4^2=5^2 then any triangle whose sides are in the ratio 3:4:5 is a right triangle. Hope it's clear. Thanks for the prompt clarification. I believe, what you said should be true. As in this problem, it took me about 4 min to solve without the Pythagorean triplet. On using the triplet, the time required was substantially less. The problem is required to be solved within 2 min. I shall go with the triplet 
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Re: If BE || CD, and BC = AB = 3, AE = 4 and CD = 10, what is [#permalink]
13 Jun 2012, 06:57
Bunuel wrote: sanjoo wrote: Attachment: trapezoid.png open this attached file.. i dont knw how can i put that question over here.. Merging similar topics. Please ask if anything remains unclear. Also please read and follow: 11-rules-for-posting-133935.htmlThank u... i just chekd out the answer.. finally got it now !!.. Thank alot...!!
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Re: If BE || CD, and BC = AB = 3, AE = 4 and CD = 10, what is [#permalink]
13 Jun 2012, 08:34
enigma123 wrote: If BE || CD, and BC = AB = 3, AE = 4 and CD = 10, what is the area of trapezoid BEDC? A. 12 B. 18 C. 24 D. 30 E. 48 Attachment: Trapezoid.GIF I am struggling to solve this. What's the concept? I can think of area of similar triangles as what Bunuel has said previously. Hi, Area of a triangle is directly proportional to square of a side. or area (ABC) = BE^2k (where k, is constant of proportionality) & area (ACD) = CD^2k& k = AB/AC=BE/CD=1/2 Thus, area (trap BCDE) = area (ACD) - area (ABC) =100k-64k=36k =36(1/2) =18 Answer is (B) Regards,
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If BE CD, and BC = AB = 3, AE = 4 and CD = 10, what is the a [#permalink]
02 Sep 2012, 11:48
The problem I am having with this question is, why are we assuming that ADC is a triangle at all? It looks like a triangle, but AB and AE also look like they are equivalent lengths, which they are not. So would couldn't BC and ED skew off into different directions while still maintaining the parallel nature of BE and CD? Because I didn't know why we should make these assumptions, I guessed. I thought we were always supposed to assume that the picture is not drawn to scale.
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Re: Geo Q from ManhGmat. How to [#permalink]
02 Sep 2012, 13:37
artuurss wrote: If BE CD, and BC = AB = 3, AE = 4 and CD = 10, what is the area of trapezoid BEDC?
12
18
24
30
48
How to solve this BE || CD and B is the middle of AC, implies that E is the middle of AD, so AD = 8. Since AC^2+AD^2=CD^2 \, \, (6^2+8^2=10^2) we can deduce that ACD is right angled triangle and its area is 6 * 8 / 2 = 24. The area of the small triangle ABE is 1/4 of the area of the large triangle ACD. Triangle ABE is similar to triangle ACD, similarity ratio being 1:2. The corresponding areas are in relation 1:4. Therefore, the area of the trapezoid BEDC is 3/4 of the area of the large triangle i.e. (3/4) * 24 = 18. Answer B.
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Re: If BE CD, and BC = AB = 3, AE = 4 and CD = 10, what is the a [#permalink]
03 Sep 2012, 04:38
dandarth1 wrote: The problem I am having with this question is, why are we assuming that ADC is a triangle at all? It looks like a triangle, but AB and AE also look like they are equivalent lengths, which they are not. So would couldn't BC and ED skew off into different directions while still maintaining the parallel nature of BE and CD? Because I didn't know why we should make these assumptions, I guessed. I thought we were always supposed to assume that the picture is not drawn to scale. Merging similar topics. Please refer to the solutions above. As for your doubt, OG13, page150: Figures: A figure accompanying a problem solving question is intended to provide information useful in solving the problem. Figures are drawn as accurately as possible. Exceptions will be clearly noted. Lines shown as straight are straight, and lines that appear jagged are also straight. The positions of points, angles, regions, etc., exist in the order shown, and angle measures are greater than zero. All figures lie in a plane unless otherwise indicated. OG13, page 272: A figure accompanying a data sufficiency problem will conform to the information given in the question but will not necessarily conform to the additional information given in statements (1) and (2). Lines shown as straight can be assumed to be straight and lines that appear jagged can also be assumed to be straight. You may assume that the positions of points, angles, regions, and so forth exist in the order shown and that angle measures are greater than zero degrees. All figures lie in a plane unless otherwise indicated. Hope it helps.
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Re: Area of Trapezoid [#permalink]
25 Apr 2013, 21:38
Bunuel wrote: Attachment: Trapezoid.GIF If BE || CD, and BC = AB = 3, AE = 4 and CD = 10, what is the area of trapezoid BEDC?A. 12 B. 18 C. 24 D. 30 E. 48 Triangles ABE and ACD are similar (they share the same angle CAD and also as BE is parallel to CD then angles by BE and CD are equal, so all 3 angles of these triangles are equal so they are similar triangles). Property of similar triangles: ratio of corresponding sides are the same: \frac{AB}{AC}=\frac{BE}{CD} --> \frac{3}{6}=\frac{BE}{10} --> BE=5 and AD=2AE=8. So in triangle ABE sides are AB=3, AE=4 and BE=5: we have 3-4-5 right triangle ABE (with right angle CAD, as hypotenuse is BE=5) and 6-8-10 right angle triangle ACD. Now, the area_{BEDC}=area_{ACD}-area_{ABE} --> area_{BEDC}=\frac{6*8}{2}-\frac{3*4}{2}=18. Answer: B. Also discussed here: trapezium-area-99966.htmlHope it helps. Hi, Straightforward: Where did you see in the question that A, B and C are aligned? The height can take any value from 0 to 3 from my understanding. Could you please clarify ? Thank you in advance. R26  Posted from GMAT ToolKit
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Re: Area of Trapezoid [#permalink]
26 Apr 2013, 00:48
R26 wrote: Bunuel wrote: Attachment: Trapezoid.GIF If BE || CD, and BC = AB = 3, AE = 4 and CD = 10, what is the area of trapezoid BEDC?A. 12 B. 18 C. 24 D. 30 E. 48 Triangles ABE and ACD are similar (they share the same angle CAD and also as BE is parallel to CD then angles by BE and CD are equal, so all 3 angles of these triangles are equal so they are similar triangles). Property of similar triangles: ratio of corresponding sides are the same: \frac{AB}{AC}=\frac{BE}{CD} --> \frac{3}{6}=\frac{BE}{10} --> BE=5 and AD=2AE=8. So in triangle ABE sides are AB=3, AE=4 and BE=5: we have 3-4-5 right triangle ABE (with right angle CAD, as hypotenuse is BE=5) and 6-8-10 right angle triangle ACD. Now, the area_{BEDC}=area_{ACD}-area_{ABE} --> area_{BEDC}=\frac{6*8}{2}-\frac{3*4}{2}=18. Answer: B. Also discussed here: trapezium-area-99966.htmlHope it helps. Hi, Straightforward: Where did you see in the question that A, B and C are aligned? The height can take any value from 0 to 3 from my understanding. Could you please clarify ? Thank you in advance. R26 Posted from GMAT ToolKitPlease read the thread: if-be-cd-and-bc-ab-3-ae-4-and-cd-10-what-is-127060.html#p1118253
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Re: Area of Trapezoid [#permalink]
26 Apr 2013, 01:02
Bunuel wrote: R26 wrote: Bunuel wrote: Attachment: Trapezoid.GIF If BE || CD, and BC = AB = 3, AE = 4 and CD = 10, what is the area of trapezoid BEDC?A. 12 B. 18 C. 24 D. 30 E. 48 Triangles ABE and ACD are similar (they share the same angle CAD and also as BE is parallel to CD then angles by BE and CD are equal, so all 3 angles of these triangles are equal so they are similar triangles). Property of similar triangles: ratio of corresponding sides are the same: \frac{AB}{AC}=\frac{BE}{CD} --> \frac{3}{6}=\frac{BE}{10} --> BE=5 and AD=2AE=8. So in triangle ABE sides are AB=3, AE=4 and BE=5: we have 3-4-5 right triangle ABE (with right angle CAD, as hypotenuse is BE=5) and 6-8-10 right angle triangle ACD. Now, the area_{BEDC}=area_{ACD}-area_{ABE} --> area_{BEDC}=\frac{6*8}{2}-\frac{3*4}{2}=18. Answer: B. Also discussed here: trapezium-area-99966.htmlHope it helps. Hi, Straightforward: Where did you see in the question that A, B and C are aligned? The height can take any value from 0 to 3 from my understanding. Could you please clarify ? Thank you in advance. R26 Posted from GMAT ToolKitPlease read the thread: if-be-cd-and-bc-ab-3-ae-4-and-cd-10-what-is-127060.html#p1118253Bunuel, It doesn t help. When i have read that thread, i GUESSED that there should have been a picture, which is not the case in the application. I have reported to add the picture if it is THE element missing for my understanding of the question. As is -without picture-, i maintain than we can only find a range. Thanks for your reply. Have a nice week end.
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Re: Area of Trapezoid [#permalink]
26 Apr 2013, 01:11
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Re: Area of Trapezoid
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26 Apr 2013, 01:11
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