Question

1. in this polygon, which angle is an exterior angle?

options: a. ( a^circ )
b. ( b^circ )
c. ( c^circ )
d. ( d^circ )

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.

• $a^\circ$ is outside the polygon, formed by a side and its adjacent extended side, fitting the definition.
• $b^\circ$ is an interior angle (inside the polygon).
• $c^\circ$ is part of a full circle around a vertex but not the exterior angle itself.
• $d^\circ$ is the angle opposite to the exterior angle, not the exterior angle.

Answer:

a. $a^\circ$