Hurry as this need to done before 10pm given that lines a and b are parallel and that m∠5 = 120°, find m∠1. a) 40° b) 60° c) 120° d) 135°

I am pretty sure that the answer is 120°

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .