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Re: What is the perimeter of right triangle ABC? (1) AB = 5 (2) [#permalink]

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01 Jun 2011, 07:32

OA is E.

But for some reason I remember learning in my High School that a right angled triangle ABC is right angled at B. If it was right angled at C, then the triangle will be referred to as ACB. Does that convention not apply to the GMAT?

Re: What is the perimeter of right triangle ABC? (1) AB = 5 (2) [#permalink]

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01 Jun 2011, 07:53

dreambeliever wrote:

OA is E.

But for some reason I remember learning in my High School that a right angled triangle ABC is right angled at B. If it was right angled at C, then the triangle will be referred to as ACB. Does that convention not apply to the GMAT?

I would expect GMAT to explicitly tell me at which angle the triangle is right angled. I leave this for some experts to answer.
_________________

But for some reason I remember learning in my High School that a right angled triangle ABC is right angled at B. If it was right angled at C, then the triangle will be referred to as ACB. Does that convention not apply to the GMAT?

That's not a convention I've ever heard of. Don't assume that on the GMAT, at least.
_________________

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If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com

Without knowing which angle is 90 degrees, how can you be sure of this? Additionally, why would you apply 30-60-90 rule here? Can you mention more about your thought process?
_________________

Re: What is the perimeter of right triangle ABC? (1) AB = 5 (2) [#permalink]

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20 Sep 2016, 08:25

E is correct. Here's why:

(1) AB = 5 --> NOT SUFFICIENT - you can't figure out perimeter of a triangle with only one side and no further information

(2) AC = 5√2 --> NOT SUFFICIENT - same as (1)

A,B,D are eliminated

Together (1) + (2) --> NOT SUFFICIENT - we don't know what is the hypotenuse and which is a side, therefore we don't know how to set up pythagorean theorem to find the missing side.

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