Question

if m<1=40 what is the measure of 5?
(a) 53
(b) 40
(c) 35
(d) 25

Answer 1

do you know that "vertical angles" are equal?



angle 1 and angle 4 are vertical angles.

so you can figure out what angle 4 is

next, notice angle 4 + angle 5 add up to 90º
if you know angle 4, you can figure out angle 5