Simple DS - help!

This topic has expert replies
Newbie | Next Rank: 10 Posts
Posts: 5
Joined: 26 Aug 2007

Simple DS - help!

by Gans » Wed Dec 19, 2007 12:43 pm
Hi,

I would like to have an answer to a rather simple DS question. My doubt essentially stems from the inconsistent answers to this question between two different GMAT tests:



DS: Is triangle ABC, with two sides of lengths 3 & 4 inches, a right-angled triangle?



(1) The length of the third side is 5 inches.

(2) Angle B = 90 degrees



Now, is the correct answer "D" or "B"? That is, would it be right in assuming that (1) implies a "classic" 3-4-5 right-triangle, which meets the Pythagorus theorem? Or, is it possible for a triangle to have sides in such a proportion without necessarily being a right-angled triangle? Of course, geometrically speaking, it seems impossible to draw such a triangle without its being a right-angled triangle.


I look forward to a conclusive answer. Thanks!

Master | Next Rank: 500 Posts
Posts: 460
Joined: 25 Mar 2007
Thanked: 27 times

by samirpandeyit62 » Wed Dec 19, 2007 11:48 pm
IMO the ans should be D,

ofcourse stmt2 is SUFF

now in stmt 1, we have a 3-4-5 triangle,

largest side is 5

& 5^2 = 3^2 + 4^2

since the pythagoras theorem is satisfied here hence the triangle must be a right angle traingle coz pythagoras theorem will not hold true for any other type of triangle except a right angled one (to the best of my knowledge)
Regards
Samir

Legendary Member
Posts: 645
Joined: 05 Sep 2007
Location: India
Thanked: 34 times
Followed by:5 members

by camitava » Thu Dec 20, 2007 12:48 am
Agree with Samir!
Correct me If I am wrong


Regards,

Amitava