BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Geometry

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 69
Joined: Sat May 10, 2008 3:05 pm
Thanked: 1 times

Geometry

by molt_llest » Sat May 31, 2008 3:05 am
Answers

a.360
b.540
c.720
d.900
e. It can not be determined from the information quiven

The correct answer is c
Attachments
Quant_PS00000177.gif
Top
Source: — Problem Solving |
Master | Next Rank: 500 Posts
Posts: 127
Joined: Sat Apr 19, 2008 1:02 am
Thanked: 12 times

by jasonc » Sat May 31, 2008 6:53 pm
we know that a triangle has 180 degrees, we also know that opposite angles are equal. So we can see that the question is asking us to find [360 degrees * 3] - [180 degrees * 2] = 720 = chioce C
I beat the GMAT! 760 (Q49/V44)
Top
Senior | Next Rank: 100 Posts
Posts: 69
Joined: Sat May 10, 2008 3:05 pm
Thanked: 1 times

by molt_llest » Sun Jun 01, 2008 3:32 am
Can you explain why do you extract 180*2? I don't get it.
Top
Master | Next Rank: 500 Posts
Posts: 192
Joined: Tue Apr 29, 2008 7:41 am
Thanked: 14 times

by aatech » Sun Jun 01, 2008 5:57 am
Suppose itenrnal angles are x, y and z

x+y+z=180

m=n=180-x
o=p=180-y
q=r=180-z

m+n+o+p+q+r = 2*(180-x)+2*(180-y)+2*(180-z)

=> 720+360-2(x+y+z) = 720 ANS
Top
Post new topic Post Reply
• Page 1 of 1