Question

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

Answer 1

Answer:

Triangles. Prove that the sum of the squares of the diagonals of a parallelogram is equal to the sum of the squares of its sides. ... Proof: Since diagonals of parallelogram bisect each other. Therefore, BO and DO are medians of ∆ABC and ∆ADC, respectively.