Question

9. If one of the angles of a parallelogram is a right angle, prove that it is rectangle.​

Answer 1

Answer:

opposite angle=90 degree(opposite angles equal)

adjacent angle(let it be a) + one angle=180 degree(supplementary angle)

a + 90 degree=180 degree

a=90 degree

opposite angle of a=90 degree(opposite angles equal)

hence parallelogram is a rectangle as all angles are 90 degree and opposite sides are equal(property of parallelogram).

Step-by-step explanation:

Answer 2

Answer:

see the attachment above

if u do it by same format u can get full marks