Circular ring

A square with an area of 16 centimeters is inscribed circle k1 and described to circle k2. Calculate the area of the circular ring, which circles k1, and k2 form.

Correct answer:

S =  12.5664 cm2

Step-by-step explanation:

S3=16 cm2 a=S3=16=4 cm r1=a/2=4/2=2 cm r2=2 r1=2 2=2 2 cm2.8284 cm S1=π r12=3.1416 2212.5664 cm2 S2=π r22=3.1416 2.8284225.1327 cm2 S=S2S1=25.132712.5664=12.5664 cm2

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