Question

What is the measure of each exterior angle of a regular quadrilateral?

Answer 1

Each exterior angle of a regular quadrilateral (a square) is `90^o`.

Explanation:

Firstly, a rather long and sophisticate term regular quadrilateral signifies a simple and familiar square.

Secondly, an exterior angle is formed by a side and a continuation of an adjacent side. This adjacent sides of a square are perpendicular, this angle is `90^o`.