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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
angle b + 120 = 180
angle b = 60
angle a + angle b = 180
angle a + 60 = 180
angle a = 120
3x = 120
x = 40
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Answer:
x=40
A=3x
A=3×40
hence A=C=120°
opposite angles of parallelogram are congruent...
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