Question

Given that lines m and n are parallel and that line t is a transversal, the measure of angle 2 is _____ degrees.

Answer 1

straight lines have a 180 degree angle

Answer 2

so this means a+c=180 and c+d=180
if a+c=180 then c=180-a
if c+d=180 then c=180-d
So this means 180-a=180-d
which means -a=-d
which means a=d