Find the circumference of the inner and the outer circles, shown in the adjoining figure. (Take π=3.14)

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56.52m, 119.32 m

66.52m, 119.32 m

56.52m, 129.32 m

66.52m, 129.32 m

answer is A.

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Detailed Solution

Concept: Given;
Radius of outer circle = 19 cm
Thickness= 10 m
Thus the radius of the inner circle= Outer radius – thickness
= 19-10
= 9m
Now we will apply the formula of circumference.
Circumference of inner circle= ${"mathml":"<math class="image_resized" style="width:192px;height:11px"><span style="font-family:$ Circumference of the outer circle ${"mathml":"<math class="image_resized" style="width:228px;height:11px"><span style="font-family:$ Hence, the correct answer is option 1.

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