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Question

If area of the ring is 3527 cm2 and inner radius is 3 cm, then find the circumference of outer circle.

A
1107 cm
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B
2207 cm
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C
4407 cm
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D
8807 cm
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Solution

The correct option is C 4407 cm
Area of ring = π(R2 - r2)
3527 = 227(R2 - 32)
35222 = (R2 - 9)
16 = (R2 - 9)
R2 = 16+9 = 25
R = 25 = 5 cm
Circumference = 2πR
= 2×227×5 = 4407 cm


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