Question

The area of a ring is a 528 CM^2 and the radius of the outer circle is 17 cm. find
a) the radius of the smaller circle b) the width of the Ring

Answer 1

area of the outer circle = π×17^2
= 289π =907.9 cm^2
so, area of smaller circle= (907.9-528)cm^2
=379.46 cm^2
(a) radius of smaller circle= √(379.46/π)
= √120.78 = 10.99 cm
(b) width of the ring = (17-10.99) cm =6.01 cm
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Answer 2

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