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Re: M2324 [#permalink]
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13 Apr 2017, 07:23
Hi All,
Must Known for GMAT,
IF YOU CAN DRAW THE FIGURE, IT MEANS THAT YOU KNOW ALL PROPERTIES
From Stem : \(width * length = 80\)
Statement 1 : \(width + length = 42\)
We have two equations, with two variables so we can solve and find the two sides : 40 and 2 ==> SUFFICIENT
Statement 2 : Shorter side is 2
So we have \(2 * length = 80\) Therefore length = 40 and thus we can draw the figure and know all the angles. ==> SUFFICIENT
Answer D.



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Re: M2324 [#permalink]
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26 Apr 2017, 03:12
What does "angle between the diagonal of the rectangle and its longer side", can someone draw it out for me please?
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Re: M2324 [#permalink]
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13 Jul 2017, 07:30
dyg wrote: Hi Bunuel,
I found the lentgh of side but since they are 2 and 40 I thought we cant determine the angle. Now I got the point. I just wanna ask something to you. In geometry (generally) is it possible to find value of an angle if we know the lenght of the sides? Hi, Just to satisfy the query of many friends  Knowing all the sides of a triangle helps in identifying the angle between any two sides. How : Here it follows: Calculate the area using Heros Formula : Area= √s(sa)(sb)(sc) where s = sum of all the sides / 2 and a,b,c are the length of the sides.  (1) Also Area = 1/2 ab sinx where x is angle between side a and b. (2) Equate (1) & (2) to extract the value of sinx or x.



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Re M2324 [#permalink]
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14 Jul 2017, 18:20
I think this is a highquality question and I don't agree with the explanation. When we solve wstatement1, we will get 2 values either (l,b) = (40,2) or (2,40), so accordingly angle will also be different. So, not sufficient. Answer must be option B. Kindly correct if I am wrong.



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Re: M2324 [#permalink]
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15 Jul 2017, 01:55
mohitpoddar wrote: I think this is a highquality question and I don't agree with the explanation. When we solve wstatement1, we will get 2 values either (l,b) = (40,2) or (2,40), so accordingly angle will also be different. So, not sufficient. Answer must be option B. Kindly correct if I am wrong. We need to find the angle between the diagonal of the rectangle and its longer side. So, it does not matter whether it's (40,2) or (2,40). In any case we should find the angle between the diagonal and the side of length 40.
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Re: M2324 [#permalink]
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15 Jul 2017, 09:21
1st Sufficient as Perimeter 2(L + B) = 84 L+B = 42 only possible values of L&B such that L+B=42 and L*B=40 is L=40 ,B=2 2nd Sufficient as shorter side = 2 , longer must be 40 to make L*B=80 OA D
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Re: M2324 [#permalink]
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20 Jul 2017, 02:03
Bunuel wrote: If the area of a rectangle is 80, what is the angle between the diagonal of the rectangle and its longer side?
(1) The perimeter of the rectangle is 84
(2) The shorter side of the rectangle is 2 Area of rectangle = 80 Let length of rectangle = L and breadth of rectangle = B => LB = 80 1. Perimeter =84 => 2(L+B) = 84 => L+B = 42 => B = 42L Now , L* (42L) = 80 => L^2  42L +80 = 0 => L^2  40L  2L +80 = 0 => (L2)(L40) = 0 => L = 2 , 40 If Length = 2 , then breadth = 40 and vice versa Now , diagonal can be calculated using Pythagoras theorem . If we know sides of a triangle , we can calculate the angle using trigonometry. Sufficient (2) The shorter side of the rectangle is 2 Sufficient  same as B = 2 and L = 40 Answer D
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Re: M2324 [#permalink]
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25 Aug 2017, 12:32
I like this Magoosh explanation in regards to determining the uniqueness of a triangle. In short, if we can determine unique values for SAS, SSS, and etc (see link for full list), then we can determine everything about a triangle since we are essentially breaking the problem down into two triangles. https://magoosh.com/gmat/2012/gmatdata ... ncerules/



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Re: M2324 [#permalink]
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27 Aug 2017, 03:11
Hi,
Statement 1 gives L=40 or 2 B= 2 or 40. Does not changing length and breadth impact the angle?



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27 Aug 2017, 03:15



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Re: M2324 [#permalink]
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05 Sep 2017, 00:16
Bunuel wrote: dyg wrote: Hi Bunuel,
I found the lentgh of side but since they are 2 and 40 I thought we cant determine the angle. Now I got the point. I just wanna ask something to you. In geometry (generally) is it possible to find value of an angle if we know the lenght of the sides? Yes, knowing the lengths of all the sides is enough to get the angels. Hi Bunuel, 1. I guess this is true for parallelograms and polygons as well? That knowing the sides is enough to know the angles. I guess Yes , because if we actually start drawing it on paper, we will be able to measure the angles with a protractor? 2. Another question, what if it was a PS question and we actually have to find the angles. I know trigo so I can use that but how do you do it without trigo? Is the ratio of angles of a triangle equal to the ratio of opp sides in all cases?
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Re: M2324 [#permalink]
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05 Sep 2017, 00:22
abhishek911 wrote: Bunuel wrote: dyg wrote: Hi Bunuel,
I found the lentgh of side but since they are 2 and 40 I thought we cant determine the angle. Now I got the point. I just wanna ask something to you. In geometry (generally) is it possible to find value of an angle if we know the lenght of the sides? Yes, knowing the lengths of all the sides is enough to get the angels. Hi Bunuel, 1. I guess this is true for parallelograms and polygons as well? That knowing the sides is enough to know the angles. I guess Yes , because if we actually start drawing it on paper, we will be able to measure the angles with a protractor? 2. Another question, what if it was a PS question and we actually have to find the angles. I know trigo so I can use that but how do you do it without trigo? Is the ratio of angles of a triangle equal to the ratio of opp sides in all cases? 1. Yes, it's true for convex polygons. 2. For PS either you won't be asked such question or it would be special triangle involved (306090, 454590).
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Collection of Questions: PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.
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Re: M2324 [#permalink]
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05 Sep 2017, 01:47
Sure. Thanks! Sent from my iPhone using GMAT Club Forum
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Re: M2324 [#permalink]
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15 Nov 2017, 21:31
from 1, what is the quick way to derive side lengths? x + y = 42 x * y = 80
How do we get 40,2?



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Re: M2324 [#permalink]
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16 Nov 2017, 06:51
Bunuel wrote: Official Solution:
Statement (1) by itself is sufficient. We can find the sides of the rectangle (40 and 2). Answer: D how did you find this? Can't sides be fractions?



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16 Nov 2017, 06:55



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Re: M2324 [#permalink]
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16 Nov 2017, 06:59
Bunuel wrote: sevenplusplus wrote: Bunuel wrote: Official Solution:
Statement (1) by itself is sufficient. We can find the sides of the rectangle (40 and 2). Answer: D how did you find this? Can't sides be fractions? Check here: https://gmatclub.com/forum/theareaof ... 57397.htmlThanks. As a general rule, can be assume: If x + y and x * y both are integers, x & y will be integers? Sent from my iPhone using GMAT Club Forum mobile app



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16 Nov 2017, 07:03



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Re: M2324 [#permalink]
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15 Jan 2018, 02:17
Bunuel wrote: dyg wrote: Hi Bunuel,
I found the lentgh of side but since they are 2 and 40 I thought we cant determine the angle. Now I got the point. I just wanna ask something to you. In geometry (generally) is it possible to find value of an angle if we know the lenght of the sides? Yes, knowing the lengths of all the sides is enough to get the angels. Could you please explain how? Thank you very much







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