If the sum and the difference of the radii of two concentric circles are 7 cm and 3 cm respectively, then find the area in between those circles.
A
11 cm2
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B
33 cm2
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C
66 cm2
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D
132 cm2
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Solution
The correct option is C 66 cm2 Given : R+r = 7 cm, R - r = 3 cm ...where r, R are inner and outer radii respectively. area of the ring = π(R2−r2) = π(R+r)×(R-r) = 227×7×3 = 22×3 = 66 cm2