Question on: JAMB Mathematics - 1993
A rectangular polygon has 150o as the size of each interior angle. How many sides has the polygon?
A
12
B
10
C
9
D
8
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Correct Option: A
A rectangular polygon has each interior angle to be 150o
let the polygon has n-sides
therefore, Total interior angle 150 x n = 150n
hence 150n = (2n - 4)90
150n = 180n - 360
360 = (180 - 150)n
30n = 360
n = 12
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