Question

answer it with complete solution

Answer 1

angle b + angle c = 180
angle b + 120 = 180
angle b = 60

angle a + angle b = 180
angle a + 60 = 180
angle a = 120

3x = 120
x = 40

Answer 2

Answer:

x=40

A=3x

A=3×40

hence A=C=120°

opposite angles of parallelogram are congruent...