Question

In a square PQRS, diagonal PR and QS intersect at O. show that

Answer 1

I hope it's help you

Answer 2

In a square the two diagonals divides it in four CONGRUENT triangles,
PROOF=
In all four triangles, Sides of all triangles will equal because square have all equal sides....... (1)

All angles of a square are equal and the diagonal bisect angles of it so angles in
all triangles will equal to each other..... (2)
From (1) & (2)
All triangles will congruent by ASA
CRITERION