Question

if one angle of a parallelogram is 90 degree then prove that it is a rectangle​

Answer 1

Answer:

Consider ABCD be a parallelogram and measure of angle C is 90°. Thus, m∠A=m∠B=m∠C=m∠D=90°. Since, all the angles of the parallelogram are equal to 90, therefore ABCD is a rectangle, by the properties of rectangle.

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Answer 2

Answer:

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