Question

straight angle
an angle with a measure less than 90°
an angle with a measure of exactly 90°
an angle with a measure between 90° and 180°
an angle with a measure of exactly 180°
an angle with a measure between 180° and 360°
angles that share a common side

Explanation:

Un ángulo recto se define como un ángulo que mide exactamente 180°, lo que forma una línea recta.

Answer:

An angle with a measure of exactly 180°