**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 figure). Find the cost of polishing the tiles at the rate of 50 p per .**

**Solution:**

Semi-perimeter of 1 triangular tile **cm**

Using **Heron's formula, **Area of 1 triangular tile

** (approx.) **

Area of 16 triangular tiles .

Polishing of 1 of area costs 50 p

Polishing of of area would cost **Rs**