A circular ring is 5 cm wide. The difference of outer and inner radius is
(a) 5cm. (b) 2.5 cm. (c) 10 cm. (d) none of these
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The answer is (a) 5cm
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Answer:
let the outer and inner radius of circle be R and r respectively
we know that,
Width of ring = outer radous - inner radius
or, R-r = 5
therefore, difference of outer and inner radius is 5 cm.
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