Question on: JAMB Mathematics - 2009
A rectangular polygon has 150o as the size of each interior angle. How many sides does it has?
A
12
B
10
C
9
D
8
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Correct Option: A
x + 150o = 180o (sum of angle on straight line)
x = 180o - 150o , x = 30o
number of sides (n) = (\frac{360}{3})
= 12
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