**An umbrella is made by stitching 10 triangular pieces of cloth of two different colours, each piece measuring 20 cm, 50 cm and 50 cm. How much cloth of each colour is required for the umbrella?**

**Solution:**

Umbrella is made up of 10 triangular pieces. 2 different colours have been used to make umbrella.

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

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

Area of 10 triangular pieces

Area used for each colour