Answers

  • Brainly User
2015-10-31T12:51:09+05:30
Interior angle = 7t
exterior angle = 2t 
7t+2t=180   angle sum property 
9t=180
t=20 
so it shows that exterior angle =  t2
so on substituting the value of t we get exterior angle =  40 
so 
no of sides = 360 / exterior angle 
no of sides = 360/40 = 9 
so it has 9 sides 
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2015-10-31T13:52:29+05:30
Interior angle is 7x 
Interior angle is 2x 
So, 7x+2x= 9x = 180 
x= 20 
exterior  angle = 2*20 = 40
So, number of sides is 360/40 = 9
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