Determine if the statement is always, sometimes or never true.
the measure of an exterior angle at the vertex of a polygon equals the measure of the adjacent interior angle.

always

sometimes

never

I believe the correct answer from the choices listed above is the last option. The measure of an exterior angle at the vertex of a polygon never equals the measure of the adjacent interior angle. Rather, they are always supplementary angles. 

Hope this answers the question. Have a nice day.