WAEC - Mathematics (2004 - No. 19)
Each interior angle of a regular polygon is 108°. How many sides has it?
5
7
9
14
คำอธิบาย
The exterior angle of the polygon = 180 – 108 = 72°. The sum of exterior angle of the regular polygon = 360°
The number of sides \(=\frac{360}{72}=5\)
The number of sides \(=\frac{360}{72}=5\)