Question

A
A
B
If one angle of a parallelogram is a right angle; prove that all other angles are right angles.​

Answer 1

Answer:

We know that in a parallelogram the opposite angles are equal. So if we consider

A = 90 then C = 90°

=> A + B + C + D = 360° ( Angle sum property)

=> 90° + 90° + 2B = 360° ( B = D oppo. angles)

=> B = D = C = A = 90°

Hence proved

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