Question

if diagonals of a paralleogram are equal then show that it is a rectangle

Answer 1

You can use congruency criteria to solve it!☺

Answer 2

tri abc &tri dcb
ab=dc opp sides of a parallelogram
bc=bc
ac=db given
sssrule
tre abc congruent to tri dcb
ab paralell &bc cuts them
angle acb= angle dcb = 180
2 angle abc = 90
abc=dbc=90
abcd is parallelogram