From the adjoining figure, find the angles of the parallelogram ABCD.
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angle CBA+80=180⁰(supplementry angle)
angle CBA=180-80
CBA=100⁰
ABCD is parallelogram so
CBA=DCB(alternate interior angle)
angle DCB=80⁰
angle BAD=DCB=80⁰(opposite angles of
parallelogram)
similarly
angle ADC=100⁰
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