Question

How do I solve this proof? I have no idea what im doing and I have a quiz tomorrow.

Answer 1

< 1 and < 3 are supplementary

Supplementary angles are angles whose measures sum to 180°.

also

< 2 and < 4 are supplementary

In this case,

m<1 + m<3 = 180°

m<2 + m<4 = 180°

m || n