daosau4120 daosau4120
  • 03-01-2019
  • Mathematics
contestada

In parallelogram ABCD, m∠ADC = 60°.



What is m∠DCB?



___°

Respuesta :

tramserran
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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