a well of a diameter 150 cm has a 30 cm wide parapet running around it .find the area of parapet
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Given diameter =150cm
Then the radius will be r=d/2
= 75cm
Given width = 30cm
Outer radius of the parapet R = 75+30 = 105cm
The area of the parapet = pi (R^2 -r^2)
=pi(105^2-75^2)
= 22/7 (11025-5625)
=22/7×5400
= 16971.428 cm^2
Then the radius will be r=d/2
= 75cm
Given width = 30cm
Outer radius of the parapet R = 75+30 = 105cm
The area of the parapet = pi (R^2 -r^2)
=pi(105^2-75^2)
= 22/7 (11025-5625)
=22/7×5400
= 16971.428 cm^2
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