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Study the quadrilateral with opposite angles and angles carefully. ...

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Study the quadrilateral with opposite angles and angles carefully.

Match the steps and reasons below to prove that is a parallelogram.

Therefore, ABCD is a parallelogram :

Angle A + Angle B + Angle C + Angle D = 360° :

Angle BAD = Angle BCD :

Angle ABC = Angle ADC :

Therefore, BC||AD :

Therefore, AB||DC :

BAD + ADC = 180° :

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