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21 December, 00:31

In parallelogram ABCD, m∠ADC = 60°.

What is m∠DCB?

___°

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  1. 21 December, 00:53
    0
    Answer: 120°

    Step-by-step explanation:

    Since it is a parallelogram, then opposite sides are parallel. Since ∠ADC is next to ∠DCB, they are supplementary angle (which means the sum of their angles is 180°).

    ∠ADC + ∠DCB = 180°

    60 + ∠DCB = 180°

    ∠DCB = 120°
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