Question

If one angle of a parallelogram is a right angle; prove that all ​

Answer 1

Step-by-step explanation:

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. Hence proved.

Explanation:

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Answer 2

Answer:

parallelogram is a quadrilateral the sum of its 4 angle will be 360 and also it's opposite angles are equal so you can take one angle x

the equation will be

90°+x+x+90°=360