Question

10. Prove that the area of a circular path of uniform width h surrounding a circular region of radius ris a h (2r+h).


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Answer 1

Answer:

Area of circular region

=area of outer-area of inner circle

=π(r+h)2−πr2

=π(r2+h2+2rh−r2)

=π(h2+2rh)

=πh(h+2r)

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