Question

Prove that the sum of the squares of the diagonals of parallelogram is equal to the sum of the squares of its side.​

Answer 1

Answer:

It's a theorem u can get it on state maharashtra board 9 geometry book

Step-by-step explanation:

It is abit of help

It states that the sum of the squares of the lengths of the four sides of a parallelogram equals the sum of the squares of the lengths of the two diagonals. ... If the parallelogram is a rectangle, the two diagonals are of equal lengths (AC) = (BD) so, and the statement reduces to the Pythagorean theorem.