Question

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?

Answer 1

Each sides of triangular shaped cloth 

Let a = 50 cm, b = 50 cm, c = 20 cm. 

∴ Perimeter = a + b + c 

= 50 + 50 + 20 = 120 cm.

∴ Total Area of Umbrella mad up with 10 triangular shaped cloth is