Inner-circle 2902

The inner-circle with a radius of 3 cm should be removed from the circle with a radius of 7 cm. How much of the area of the large circle will be removed? Express result in percent.

Correct answer:

p =  0.1837 %

Step-by-step explanation:

r1=7 cm r2=3 cm  A=π r12=3.1416 72153.938 cm2 B=π r22=3.1416 3228.2743 cm2  x=B/A=28.2743/153.938=4990.1837  p=100 x=100 0.1837=4990018.3673=0.1837%

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