Find the area of the circular ring formed by two concentric circles, given that the radii of the outer and the inner circles are 4 cm and 2 cm respectively
A
75.33 sq. cm
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B
12.36 sq. cm
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C
23.47 sq. cm
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D
37.68 sq. cm
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Solution
The correct option is B37.68 sq. cm
The area of the region enclosed by two concentric circles is given by
A=π(R2–r2)
Here, R=4cm, r=2cm and π = 3.14
So Area, A=3.14(16–4)sqcm = 3.14(12)sqcm=37.68sq.cm.