Around the circular flowerbed with a radius of 2 m is a sidewalk 80 cm wide. How many square meters does the sidewalk have?

Correct answer:

S =  12.0637 m2

Step-by-step explanation:

r1=2 m x=80 cm m=80:100  m=0.8 m  r2=r1+x=2+0.8=514=2.8 m  S1=π r12=3.1416 2212.5664 m2 S2=π r22=3.1416 2.8224.6301 m2  S=S2S1=24.630112.5664=12.0637 m2

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