Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 11 Mar 2014, 23:58

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Right triangle ABC has a height BD. What is the value of AB

Author Message
TAGS:
Director
Joined: 22 Aug 2007
Posts: 573
Followers: 1

Kudos [?]: 7 [0], given: 0

Right triangle ABC has a height BD. What is the value of AB [#permalink]  10 Oct 2007, 21:17
00:00

Difficulty:

5% (low)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Right triangle ABC has a height BD. What is the value of AB times BC?

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

DS
Senior Manager
Joined: 27 Aug 2007
Posts: 257
Followers: 1

Kudos [?]: 8 [0], given: 0

isn't it B,

it already tells that 'The product of the non-hypotenuse sides is equal to 24'

Ans: B
Director
Joined: 22 Aug 2007
Posts: 573
Followers: 1

Kudos [?]: 7 [0], given: 0

Ferihere wrote:
isn't it B,

it already tells that 'The product of the non-hypotenuse sides is equal to 24'

Ans: B

AO is B,

I am just thinking that,

AB and AC could be the non-hypotenuse sides and BC the hypotenuse.

The stem says BD is the height, so if point D coincides with A, then it is still height. (there is no info limiting this possibility)

Please explain where I am wrong in my reasoning. Thank you.
Manager
Joined: 07 Sep 2007
Posts: 121
Followers: 1

Kudos [?]: 9 [0], given: 0

IrinaOK wrote:
Ferihere wrote:
isn't it B,

it already tells that 'The product of the non-hypotenuse sides is equal to 24'

Ans: B

AO is B...

I am just thinking why can`t it be that,

AB and AC are the non-hypotenuse sides and BC is the hypotenuse.

The stem says BD is the height, so if point D coincides with A, then it is still height. (there is no info limiting this possibility)

Please explain where I am wrong in my reasoning. Thank you.

I agree with your reasoning that the OA is wrong.

Perhaps the question was supposed to come with a diagram that shows which corner has the right angle. If we know D does not coincide with A, then B is correct. If we know that D does coincide with A, then C would be correct.
VP
Joined: 09 Jul 2007
Posts: 1111
Location: London
Followers: 6

Kudos [?]: 63 [0], given: 0

Re: DS_right triangle_ disagree with OA [#permalink]  11 Oct 2007, 01:59
IrinaOK wrote:
Right triangle ABC has a height BD. What is the value of AB times BC?

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

DS

I think, from the stem above, only traingle that can be drawn is TRAINGLE 1 below. furthermore stem says BD is the height. if it coincides with AB then stem should not mention the point D. so it doesnt coincide.

any ideas?
Attachments

traingles.JPG [ 11.21 KiB | Viewed 291 times ]

Manager
Joined: 03 Oct 2007
Posts: 61
Followers: 4

Kudos [?]: 9 [0], given: 0

Ravshonbek:

In your diagram angle B is the right angle, what if the right angle in the triangle is A or C?
VP
Joined: 09 Jul 2007
Posts: 1111
Location: London
Followers: 6

Kudos [?]: 63 [0], given: 0

Hyperstorm wrote:
Ravshonbek:

In your diagram angle B is the right angle, what if the right angle in the triangle is A or C?

Hi Hyperstorm,

good question. did not think about that.

Right triangle ABC has a height BD. What is the value of AB times BC?

it can be C or A.
then try to make BD height from ABC whose right angle is not B.
i could not figure out anythign from that. i am sure there should be smth else if you bring that up here.

I understand that BD can coincide with one of the hypotenuses. then why the stem mentions the POINT D. instead it can say BA or BC or other.
To me the stem is fine. but let's wait until Tino makes move.
Senior Manager
Joined: 27 Aug 2007
Posts: 257
Followers: 1

Kudos [?]: 8 [0], given: 0

IrinaOK wrote:
Ferihere wrote:
isn't it B,

it already tells that 'The product of the non-hypotenuse sides is equal to 24'

Ans: B

AO is B,

I am just thinking that,

AB and AC could be the non-hypotenuse sides and BC the hypotenuse.

The stem says BD is the height, so if point D coincides with A, then it is still height. (there is no info limiting this possibility)

Please explain where I am wrong in my reasoning. Thank you.

You would be right if the question would not classify a point B, in other words question does not says any hypotenuse, it states that it is BD. If height lies on one of the sides of triangle than there would be 4 points ABCD and BD would be some portion of triangle's side, which is not height actually.

If you have any question feel free to ask...
Director
Joined: 22 Aug 2007
Posts: 573
Followers: 1

Kudos [?]: 7 [0], given: 0

Ferihere, Ravshonbek, thank you for your explanations.

Please kindly have a look at the picture below. I used Ravshonbek`s drawing.

If it is first triangle the asnwer is B, if it is second triangle the asnwer is C, just as Jing wrote above.

It is second triangle, if point D coincides with point A (stem gives no info that would limit this posssibility). Thus, BA is the same as BD and both are heights of the triangle.

I used the definition of height from OG11th, p. 130-131.

Can it be that in GMAT, annotation of right triangle already indicates what letter represents the right angle?

for example:

ABC--------> B must be the right angle
ACB--------> C must be the right angle

Attachments

traingles_editted.jpg [ 8.66 KiB | Viewed 263 times ]

Director
Joined: 03 May 2007
Posts: 899
Schools: University of Chicago, Wharton School
Followers: 5

Kudos [?]: 34 [0], given: 6

Re: DS_right triangle_ disagree with OA [#permalink]  11 Oct 2007, 21:42
IrinaOK wrote:
Right triangle ABC has a height BD. What is the value of AB times BC?

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

DS

B cannot be OA. only C can be the OA.

Scenerio: ABC is a right angle triangle so any angle could be right angle and any side can be Hypoteneous (H), base (B) and perpendicular (P). but we do not know.

Since BD is a highet of the triangle, it is perpendicuar to the hypoteneous.

1: St 1 tells us nothing. AB could be H or B or P. .......
2: st 2 also doesnot tell the measures clearly. because we do not know which one is B, P, and H.

From 1 and 2, we can say that AB is not H, which should be grater than 6. AB is either B or P and BC is what AB is not.

So AB x BC should equal to 24.
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5099
Location: Singapore
Followers: 15

Kudos [?]: 116 [0], given: 0

IrinaOK wrote:
Ferihere, Ravshonbek, thank you for your explanations.

Please kindly have a look at the picture below. I used Ravshonbek`s drawing.

If it is first triangle the asnwer is B, if it is second triangle the asnwer is C, just as Jing wrote above.

It is second triangle, if point D coincides with point A (stem gives no info that would limit this posssibility). Thus, BA is the same as BD and both are heights of the triangle.

I used the definition of height from OG11th, p. 130-131.

Can it be that in GMAT, annotation of right triangle already indicates what letter represents the right angle?

for example:

ABC--------> B must be the right angle
ACB--------> C must be the right angle

I go with B on this one. The first triangle would be the most possible case. The second triangle requires an assumption that point A is also point D, and the GMAT doesn't gives leeways for these assumptions. However, that part about the annotation of a right triangle given by the OG is new stuff to me.
Director
Joined: 22 Aug 2007
Posts: 573
Followers: 1

Kudos [?]: 7 [0], given: 0

ywilfred wrote:
IrinaOK wrote:
Ferihere, Ravshonbek, thank you for your explanations.

Please kindly have a look at the picture below. I used Ravshonbek`s drawing.

If it is first triangle the asnwer is B, if it is second triangle the asnwer is C, just as Jing wrote above.

It is second triangle, if point D coincides with point A (stem gives no info that would limit this posssibility). Thus, BA is the same as BD and both are heights of the triangle.

I used the definition of height from OG11th, p. 130-131.

Can it be that in GMAT, annotation of right triangle already indicates what letter represents the right angle?

for example:

ABC--------> B must be the right angle
ACB--------> C must be the right angle

I go with B on this one. The first triangle would be the most possible case. The second triangle requires an assumption that point A is also point D, and the GMAT doesn't gives leeways for these assumptions. However, that part about the annotation of a right triangle given by the OG is new stuff to me.

for the sake of clarity, it was just a question...
CEO
Joined: 29 Mar 2007
Posts: 2596
Followers: 16

Kudos [?]: 166 [0], given: 0

Re: DS_right triangle_ disagree with OA [#permalink]  11 Oct 2007, 22:09
Fistail wrote:
IrinaOK wrote:
Right triangle ABC has a height BD. What is the value of AB times BC?

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

DS

B cannot be OA. only C can be the OA.

Scenerio: ABC is a right angle triangle so any angle could be right angle and any side can be Hypoteneous (H), base (B) and perpendicular (P). but we do not know.

Since BD is a highet of the triangle, it is perpendicuar to the hypoteneous.

1: St 1 tells us nothing. AB could be H or B or P. .......
2: st 2 also doesnot tell the measures clearly. because we do not know which one is B, P, and H.

From 1 and 2, we can say that AB is not H, which should be grater than 6. AB is either B or P and BC is what AB is not.

So AB x BC should equal to 24.

I agree I came across this question and had the same problem.
Re: DS_right triangle_ disagree with OA   [#permalink] 11 Oct 2007, 22:09
Similar topics Replies Last post
Similar
Topics:
If the length of side AB is 17, is triangle ABC a right 12 24 Jul 2007, 18:06
Right triangle ABC has a height BD, What is the value of AB 7 13 Nov 2007, 09:20
1 If the length of side AB is 17, is triangle ABC a right 6 13 Jan 2008, 14:40
What is the perimeter of right triangle ABC? (1) AB = 5 (2) 6 01 Jun 2011, 06:07
Triangle ABC is right angled at B. BD, the median to 3 04 Jun 2011, 08:08
Display posts from previous: Sort by