posted by Faswana .
A rhombus sheet,whose perimeter is 32 m and whose one diagonal is 10 m long , is painted on both the sides of Rs.5 per m^2.Find the cost of the painting
Since the diagonals of a rhombus are perpendicular, and all four sides are the same length, the rhombus can be divided into four right triangles with one leg of 5 and an hypotenuse of 8. So, the other leg is √39
So, the area of all four triangles is 10√39 m^2
Multiply that by the cost of the paint.