Question on: WAEC Mathematics - 2010
The sum of the exterior of an n-sided convex polygon is half the sum of its interior angle. find n
A
6
B
8
C
9
D
12
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Correct Option: A
sum of exterior angles = 360o
Sum of interior angle = (n - 2) x 180
360 = (\frac{1}{2}) x(n - 2) x 180(90o)
360 = (\frac{1}{2}) x(n - 2) x 90o
(\frac{360}{90}) = a - 2
4 = n - 2
n = 4 + 2 = 6
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