Sidewalk 6347

There is a sidewalk 70 cm wide around the circular law with a radius of 2.3 m. How many square meters does the sidewalk have?

Correct answer:

S =  11.6553 m2

Step-by-step explanation:

r1=2.3 m x=70 cm m=70:100  m=0.7 m r2=r1+x=2.3+0.7=3 m  S1=π r12=3.1416 2.3216.619 m2 S2=π r22=3.1416 3228.2743 m2  S=S2S1=28.274316.619=11.6553 m2

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