2
ZD.
3
8. Find the angles of the parallelogram ABCD if (1) A: B = 2 : 7
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A + B = 180° ( Sum of adjacent sides of a parallelogram is 180° )
2x + 7x = 180°
9x = 180°
x = 20°
<A = 40°
<B = 140°
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