How much cloth material will be required to cover two big domes each of radius 3.5 Metres use Π 22 7?

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amitnrwGenius34.6K answers304.8M people helped

Given : 2 hemispherical domes

To Find : How much cloth material will be required to cover 2 big domes each of radius 2.5metres

a) 75m2

b) 78.57m2

c) 87.47m2

d) 25.8m2

Solution:

To Cover Dome we need to cover Curved surface area only with cloth

as base is on ground

CSA of Hemisphere = 2 πr²

r = 2.5 m

CSA of one Dome = 2 π(2.5)²

CSA of two Domes = 2 x 2 π(2.5)²

= 25π m²

π = 22/7

= 25 x 22/7

= 78.57 m²

78.57 m² cloth material will be required to cover 2 big domes each of radius 2.5metres

option b is correct