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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.

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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?

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The sides of triangular shaped cloth of umbrella are a = 20 cm, b = 50 cm, c = 50 cm 

If s is semi perimeter of piece of triangular shaped cloth. 

2s = a + b + c 

= 20 + 50 + 50 = 120cm

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