Question

sum of external angles and internal angles of a polygon are equal

Answer 1

360+(n-2)180 this is sum of internal and external angles of any polynomials

Answer 2

Sum of internal angles of a polygon of side n is given as:

$s = (n - 2) {180}^{o}$
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Sum of external angles of a polygon is always 360°. No matter which polygon it is or how many sides it has, the sum of external angles is always 360°.