daosau4120 daosau4120

03-01-2019
Mathematics

contestada

In parallelogram ABCD, m∠ADC = 60°.

What is m∠DCB?

___°

Respuesta :

tramserran tramserran

03-01-2019

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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