Sidewalk

The city park is a circular bed of flowers with a diameter of 8 meters, around it the whole length is 1 meter wide sidewalk . What is the sidewalk area?

Correct result:

S =  28.27 m2

Solution:

D=8 m r=D/2=8/2=4 m s=1 m  S1=π⋅ r2=3.1416⋅ 42≐50.2655 m2 S2=π⋅ (r+s)2=3.1416⋅ (4+1)2≐78.5398 m2  S=S2−S1=78.5398−50.2655=28.27 m2

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