Round flowerbed

Around a round flowerbed with a diameter of 6 meters, I will make a sidewalk up to 0.5 meters wide. How much gravel is needed if the layer is 5 cm high?

Correct answer:

V =  0.5105 m3

Step-by-step explanation:

D=6 m h=0.5 m c=5 cm m=5:100  m=0.05 m  r=D/2=6/2=3 m r2=r+h=3+0.5=27=3.5 m  S=π r22π r2=3.1416 3.523.1416 3210.2102 m2  V=S c=10.2102 0.05=0.5105 m3

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