Question

The area of a ring is 528 sq.cm and the radius of the outer circle is 17cm. Find:
(i) the radius of the smaller circle.
(ii) the width of the ring.

Answer 1

Answer:

Step-by-step explanation:

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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