Sum of interior angle in a regular polygon = (2n - 4)90
(2n - 4)90 = 3240
180n - 360 = 3240
180n = 3600;
n = 20
number of sides = $\frac{360^o}{exterior angle}$
20 = $\frac{360}{x}$; x = $\frac{360}{20}$ = $18^o$
johnmulu answered the question on June 9, 2017 at 08:30
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