Asked by Vivek

Prove that the area of a circular path of uniform width h surrounding a circular region of radius r is pi h (2r+h)
Answered by Steve
A(r) = πr^2
A(r+h) = π(r+h)^2

now subtract.
Answered by krishna
Prove that the area of circular path of uniform width h surrounding a circular region at radius r is pi h 2r+h
Answered by Deepak
2pieh (2r+h)
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