Circular ring

Square with area 16 centimeters square are inscribed circle k1 and described circle k2. Calculate the area of circular ring, which circles k1, k2 form.

Correct result:

S =  12.5664 cm2

Solution:

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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