Q8. A floral design on a floor is made up of 16 tiles which are triangular, the sides of the triangle being 9 cm, 28 cm and 35 cm (see Fig. 12.18). Find the cost of polishing the tiles at the rate of 50p per cm2.
GIven the sides of the triangle are:
So, its semi-perimeter will be:
Therefore, the area of the triangle using Heron's formula is given by,
So, we have the area of each triangle tile which is .
Therefore, the area of each triangular 16 tiles will be:
Hence, the cost of polishing the tiles at the rate of 50 paise per cm2 will be: