Question

area of rhombus is 90 centimetre if one diagonal is 10 cm find the perimeter

Answer 1

the diagonals of a rhombus bisect each other at 90 degrees so you get 4 right angles triangle supposing height as x and base as given diagonal by 2
you can write 1/2 base *height is equal to area of rhombus divided by 4. after getting the hypotenuse that is length of 1 side multiply by 4 to get perimeter as all sides of rhombus are equal