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Geometry

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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
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by molt_llest » Sun Jun 01, 2008 3:32 am
Can you explain why do you extract 180*2? I don't get it.
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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
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