I need help with a geometry problem

Mathematics
Tutor: None Selected Time limit: 1 Day

Nov 7th, 2015

Thank you for the opportunity to help you with your question!

To solve this problem we should remember that the sum of the adjacent angle of the parallelogram is equal to 180 degree.The adjacent angles of a parallelogram are supplementary (supplementary angles are two angles that add up to 180°)

Here the angle ADC and DCB are adjacent angle therefore their sum is equal to 180.

angle ADC+angle DCB=180

Given measure of angle DCB=60 degree

Substitute in the above equation we have

angle ADC+60=180

angle ADC=180-60

angle ADC=120 degree(answer)

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Nov 7th, 2015

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