Question

14. If one angle of a parallelogram is 90°, show that each of its angles measures 90°.
two parallelograms.​

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. Hence proved.

or

a parallelogram can be defined as a quadrilateral whose two sides are parallel to each other and all the four angles at the vertices are not 90 degree or right angles then the quadrilateral is called a parallelogram opposite sides of a parallelogram or also equal in length

in short we can say that it is not possible in a parallelogram that all the angles are equal because it only happens in a rhombus