Question

what is the measure of an exterior angle in a square? write your answer as an integer or as a decimal rounded to the nearest tenth.

Explanation:

Step1: Recall square's interior angle

A square has interior angles of $90^\circ$ each.

Step2: Use linear pair for exterior angle

An interior angle and its corresponding exterior angle form a linear pair, so they sum to $180^\circ$. Let the exterior angle be $x$. Then $x + 90^\circ= 180^\circ$. Solving for $x$, we get $x = 180^\circ - 90^\circ = 90^\circ$.

Answer:

90