Concentric 6751

A circle K with radius r = 8 cm is given. How big a radius must a smaller concentric circle divides a circle K into two parts with the same area?

Correct answer:

r2 =  5.6569 cm

Step-by-step explanation:

r=8 cm S=π r2=3.1416 82201.0619 cm2 S2=S/2=201.0619/2100.531 cm2  r2=S2/π=100.531/3.1416=4 2=5.6569 cm

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