In the adjoining figure, is a parallelogram in which Calculate and

In ABCD, A = 72°


We know that opposite angles of a parallelogram are equal.
Hence, A = C and B = D
C = 72°
A and B are adjacent angles.
A + B = 180°
B = 180°° A
B = 180° 72° = 108°
B = D = 108°
Hence,
B = D = 108° and C = 72°


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