Answer:
120
Step-by-step explanation:
We know <1 = 30 since it is a vertical angle
<2 = 60 since <1+<2 make a right triangle ( a perpendicular to e)
<1 + <2 must equal 90
30+ <2 = 90
Since b is parallel to c
<2 = <4 so 4 = 60
<4 and <3 are corresponding angles, the add to 180 degrees
<4 + <3 =180
60 + <3 =180
<3 = 120 degrees
