Question

If the sum of the interior angles of a polygon is equal to 20 right angles ,then the number of sides of polygon is : (a) 8 sides (b) 12 sides (c) 6 sides (d) 10 sides

Answer 1

given:
if sum of int.angles=180
then,no of sides=?
so,
180(n-2)=1800[here n=no. of sides]
on putting n = 8
we get,
180(8-2)=1800
180*6=1080(ehich is not equal to 180)
again,
180(12-2)=1800
180*10=1800
1800=1800
thus,

If the sum of the interior angles of a polygon is equal to 20 right angles ,then the number of sides of polygon is12

Answer 2

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