Question

1. which angle is an exterior angle? (options: k°, a°, d°, e°)

Explanation:

An exterior angle of a polygon is formed by one side of the polygon and the extension of an adjacent side, lying outside the polygon.

• $k^\circ$ is a full reflex angle around a vertex, not an exterior angle.
• $a^\circ$ is a full reflex angle around a vertex, not an exterior angle.
• $d^\circ$ is formed by a side of the polygon and the extension of an adjacent side, lying outside the polygon, fitting the definition of an exterior angle.
• $e^\circ$ is an interior angle of the polygon, lying inside it.

Answer:

d. $d^\circ$