Parallelogram 71214

How big are the internal angles in the parallelogram when we know that the angle at one vertex is twice as large as the others?

Correct answer:

α =  60 °
β =  120 °
γ =  60 °
δ =  60 °

Step-by-step explanation:

α+β=180  β=2α  α+2α=180   α=180/3=60
β=2 α=2 60=120

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