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let angle A and B be 3x and 7x
3x+7x=180(adjacent angles of parallelogram are supplementary)
10x=180
x=180/10
x=18°
3x=18°×3=54°
7x=18°x7=126°
angle C and D will be equal to 54°and 126° respectively (opposite angle of parallelogram are equal)
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