Prove that the area of a rhombus is equal to half of the product of the diagonals.

Focal length is equal to half of the

Prove that the sum of the squares of the sides of a rhombus is equal to the sum of the squares of its diagonals

If a triangle and a parallelogram lie on the same base and between the same parallels, then prove that the area of the triangle is equal to half of the area of parallelogram.

Are the opposite angles of a rhombus equal ?

Prove that a cyclic rhombus is a square

Prove that the sum of the squares of the diagonals of rhombus is equal to the sum of the squares of the sides.

Prove that all the lines having the sum of the interceps on the axes equal to half of the product of the intercepts pass through the point. Find the fixed point.

If the diagonal of a rhombus are equal, then the rhombus is a

Prove that twice the area of a parallelogram is equal in the area of another parallelogram formed by taking as its adjacent sides of the diagonals of the former parallelogram.