Circular lawn

Around a circular lawn area is 2 m wide sidewalk. The outer edge of the sidewalk is curb whose width is 2 m. Curbstone and the inner side of the sidewalk together form a concentric circles. Calculate the area of the circular lawn and the result round to 10's m2.

Correct result:

S =  1660 m2


o=2πr r=o/(2π)=24.987 S=π(r2)2=π(24.9872)2=1660 m2

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