Grass seeds

How many kg of grass seed is needed to be sowing a circular field with a diameter of 120 meters when the 1 m2 should be used 0.8 grams seeds?

Correct answer:

x =  9.05 kg

Step-by-step explanation:

D=120 m ρ=0.8 g/m2  r=D/2=120/2=60 m S=π r2=3.1416 60211309.7336 m2  m=S ρ=11309.7336 0.89047.7868 g  x=m kg=m/1000  kg=9047.7868/1000  kg=9.05 kg=9.05 kg

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