Question

1. which angle is an exterior angle?

Explanation:

An exterior angle of a polygon is formed by one side of the polygon and the extension of an adjacent side. Looking at the figure:

• $a^\circ$, $c^\circ$, $d^\circ$, $e^\circ$, $f^\circ$, $i^\circ$, $k^\circ$ are all formed by extending a side of the trapezoid (the polygon here) and an adjacent side, fitting the definition of an exterior angle.
• The angles $60^\circ$, $50^\circ$, $g^\circ$ are interior angles of the trapezoid, lying inside the polygon.

Answer:

The exterior angles are $\boldsymbol{a^\circ}$, $\boldsymbol{c^\circ}$, $\boldsymbol{d^\circ}$, $\boldsymbol{e^\circ}$, $\boldsymbol{f^\circ}$, $\boldsymbol{i^\circ}$, $\boldsymbol{k^\circ}$