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Question

# The radius of the inner circle is 9yd. The difference between the outer diameter and the inner diameter is 2 yd. What is the radius of the outer circle?

A
9 yd
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B
11 yd
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C
10 yd
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D
8 yd
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Solution

## The correct option is C 10 ydRadius OR of the inner circle = 9 yd We have to calculate the radius of the outer circle. As we know, Diameter = 2 × Radius Diameter of the inner circle = 2 × 9 yd = 18 yd Difference between the diameter of the outer circle and the inner circle = 2 yd Which means, diameter of the outer circle − diameter of the inner circle = 2 yd Diameter of the outer circle - 18 yd = 2 yd Diameter of the outer circle = 2 yd + 18 yd = 20 yd Radius = Diameter ÷ 2 ∴ Radius OT of the outer circle = 20 yd ÷ 2 = 10 yd

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