The radius of the outer circle shown above is 1.2 times greater than the radius of the inner circle.
What is the area of the shaded region?
A . 6π m2
B . 9π m2
C . 25π m2
D . 30π m2
E . 36π m2
Answer: B
Explanation:
The area of a circle is equal to πr2. The radius of the inner circle is 5 m; therefore, the area of the inner circle is 25π m2. The radius of the outer circle is 1. 2 × 5 = 6 m; therefore, the area of the outer circle is 36π. Subtract the area of the inner circle from the area of the outer circle: 36π C 25π = 9π m2.
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