Geometry Proofs

Question

Angle 1 and angle 3 are supplementary, angle 2 and angle 3 are supplementary. prove that measure of angle 1 equals measure of angle 3.

Answer 1

The measure of angle 1 does not necessarily equal the measure of angle 3.

I think the question they are probably asking is "Prove measure of angle 1 equals measure of angle 2."