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# M04 #12

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VP
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29 Oct 2008, 22:45
Distinct points A,B , C , D form a right triangle ABC with a height BD . What is the value of AB times BC ?

1. AB = 6
2. The product of the non-hypotenuse sides is equal to 24

In this question, i fail to understand y is D given. Since all points are distinct then how cum BD is the height?

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30 Oct 2008, 08:07
ritula wrote:
Distinct points A,B , C , D form a right triangle ABC with a height BD . What is the value of AB times BC ?

1. AB = 6
2. The product of the non-hypotenuse sides is equal to 24

In this question, i fail to understand y is D given. Since all points are distinct then how cum BD is the height?

I think it is B. from the information given, AC has to be hypoteneous. Then AB and AC become non-hypoteneous sides. so st taement 2 is suff.

Source?
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30 Oct 2008, 08:11
Yes, I have had this qs in one of the tests , the QA was B i remember. Can you pls check if its D ? because i think its clearly B.

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30 Oct 2008, 23:50
Guys , I think I cldnt explain my problem. Im not talking of OA. OA is B indeed 2 which i agree. My question is why is point D given in the question. there is no need for this. In case its a triangle, there have 2b only 3 points na? also BD height is confusing me.

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05 Dec 2008, 14:28
This was a poorly written question. It could easily be argued that AB and BC are not "non-hypotenuse sides" because they are the hypotenuses of triangles ABD and BDC, respectively. BD is the only side in the entire problem that is not the hypotenuse of any triangle. Overall, very confusing. Could be improved with either an accompanying picture or with clarifying language in the problem. It was an easy problem - understanding the information they were giving you was ambiguous at best.

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05 Dec 2008, 22:14
JorgeStevenson wrote:
This was a poorly written question. It could easily be argued that AB and BC are not "non-hypotenuse sides" because they are the hypotenuses of triangles ABD and BDC, respectively. BD is the only side in the entire problem that is not the hypotenuse of any triangle. Overall, very confusing. Could be improved with either an accompanying picture or with clarifying language in the problem. It was an easy problem - understanding the information they were giving you was ambiguous at best.

To me question stems is looking very clear:

we know that triangle ABC is a right triangle, we know that the 4 points are distinct. That means that BD is the Height to the hypotenuse AC, you don't even need to draw a triangle to figure that.

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24 Jan 2009, 22:38
Distinct points A ,B, C,D form a right triangle ABC with a height BD . What is the value of AB times BC ?
1. AB=6
2. The product of the non-hypotenuse sides is equal to 24

I got so confused with why D is listed and if the order can be A,B, C or could be different. Is this intentional?

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25 Jan 2009, 02:31
ConkergMat wrote:
Distinct points A ,B, C,D form a right triangle ABC with a height BD . What is the value of AB times BC ?
1. AB=6
2. The product of the non-hypotenuse sides is equal to 24

I got so confused with why D is listed and if the order can be A,B, C or could be different. Is this intentional?

Is it B?
Here is how I understand it: A triangle has 3 heights. In right triangle, the two of them are the sides of the triangle and a third one is on the right angle to the hypotenuse. In this question, it is this third one. If it wouldn't be the case, the question would use two of the letters from "ABC".

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21 Aug 2009, 20:51
"If distinct points A, B, C, and D form a right triangle ABC with a height BD, what is the value of AB times BC?"

The language of this question appears at odds with the author's intent.

With respect to a triangle, the word "height" really only means "a line segment perpendicular to a triangle's edge, of a length equal to the distance of that edge from the opposite vertex." Height BD may or may not land D on the perimeter of the triangle. A line segment labeled "height" may just as easily be outside the triangle as inside the triangle, and is indeed outside the triangle in one example from a Grade 6 math text. "Height" means whatever helps you calculate the area of a triangle most easily; GMAC's OG12 does not use this term.

The term "altitude" would make the answer explanation work. From OG12 p.130: "The altitude of a triangle is the segment drawn from a vertex perpendicular to the side opposite that vertex." D must then lie on the perimeter of right triangle ABC, and B must be opposite the hypotenuse AC for D to be distinct from A and C.

Since GMAC does apparently regard "altitude" as fair game on the exam, and even gives the area of a triangle as "0.5*(base plus altitude)" on OG12 p.130, is there any chance of having this question amended to refer to "altitude BD" rather than "height BD" for future M04 takers?

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21 Aug 2009, 21:04
Just stick to "Distinct points A , B , C , D" form a right triangle ABC with a height BD.

That mean AC is the hypotenuse side.

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11 Oct 2009, 01:30
Question here,

When they said that DB is the hight of ABC (right triangle) that means DB intersects with AC (hypotenuse), then is DB perpendicular on AC??

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13 Oct 2009, 03:59
rshawabka wrote:
Question here,

When they said that DB is the hight of ABC (right triangle) that means DB intersects with AC (hypotenuse), then is DB perpendicular on AC??

Hi there

yes, this is a geometry theorem

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21 Oct 2009, 18:25
Yes,
If it says hight it is always perpendicular to the side which it crosses.
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21 Oct 2009, 18:59
IMO B

S2 gives product of AB and BC (which are non-hypotenuse sides).

is there any catch ? whats the OA?
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25 Oct 2009, 02:33
Whats the OA?
Stmt 1: Quesrie: doesn't BD bisect AC? then,AD=AC....hmm?
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07 Nov 2009, 00:31
Point D is crucial to solve this question as it is used to identify the non-hypotenuse sides (AB and BC)

Thus, B is the best for me

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19 Jan 2010, 19:13
Could someone post a diagram? I think that would help me a lot. I don't understand where "D" is coming from either.

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22 Mar 2010, 08:59
Take a look at the diagram here: http://en.wikipedia.org/wiki/Right_triangle

As per wikipedia, there are 3 ways to calculate the area of a right triangle:

"As with any triangle, to calculate the area, multiply the base and the corresponding height, and divide it by two. If ABC is a right triangle in A, each of the sides [AB] and [AC] can be considered as the height; the base is then the other side of the right angle ([AC] and [AB], respectively)."

Finally: "The area of the triangle could also be calculated by using the hypotenuse as the base. One would then have to calculate the height associated with the hypotenuse, as it would no longer be one of the sides."

Therefore, in the picture in wikipedia, besides using the legs, the only other way to draw a "height" of the triangle is to draw a line from the right angle vertex (A) to the hypotenuse (BC).

Same logic would apply in this problem.

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25 Mar 2010, 00:31
aelfred wrote:
"If distinct points A, B, C, and D form a right triangle ABC with a height BD, what is the value of AB times BC?"

The language of this question appears at odds with the author's intent.

With respect to a triangle, the word "height" really only means "a line segment perpendicular to a triangle's edge, of a length equal to the distance of that edge from the opposite vertex." Height BD may or may not land D on the perimeter of the triangle. A line segment labeled "height" may just as easily be outside the triangle as inside the triangle, and is indeed outside the triangle in one example from a Grade 6 math text. "Height" means whatever helps you calculate the area of a triangle most easily; GMAC's OG12 does not use this term.

The term "altitude" would make the answer explanation work. From OG12 p.130: "The altitude of a triangle is the segment drawn from a vertex perpendicular to the side opposite that vertex." D must then lie on the perimeter of right triangle ABC, and B must be opposite the hypotenuse AC for D to be distinct from A and C.

Since GMAC does apparently regard "altitude" as fair game on the exam, and even gives the area of a triangle as "0.5*(base plus altitude)" on OG12 p.130, is there any chance of having this question amended to refer to "altitude BD" rather than "height BD" for future M04 takers?

Since the stimulus states the triangle ABC is a right triangle, D must lie on one of the sides.

also,
One might assume the following,
If we draw the right triangle ABC with D lieing on AC.
S1 tells us that AB = 6. Since this is a right triangle, then the other sides are 8 and 10 by using the pythagorean triples 3-4-5. (use a factor of 2)

However,
the sides could also be 2.5, 6, 6.5 using the pyth. triple of 5-12-13 (use a factor of 1/2)

Therefore S1 is not sufficient.
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03 Jul 2010, 02:21
If distinct points A ,B ,C , and D form a right triangle ABC with a height BD , what is the value of AB times BC ?

1. AB =6
2.The product of the non-hypotenuse sides is equal to 24.

I got it wrong because of the language/wording "what is AB times BC"
Does it mean AB*BC?
or value of AB is how much times BC?

Is this correct wording or language???? Both meaning changes the answer
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# M04 #12

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