JAMB - Mathematics (1982 - No. 28)
In a regular polygon of n sides, each interior angle is 144o. Find n
12
11
10
8
6F
คำอธิบาย
Formula for an interior angle of a polygon is (2n - 4) x 90
(2n - 4) x 90 = 144n
180n - 360 = 144n
180n - 144n = 360
36n = 360
n = \(\frac{360}{36}\)
= 10