Circular 72244

How many kg of grass seed must be bought to start a lawn in the shape of a circular section with a radius of r= 15 m and a central angle of 45 degrees if 1 g of grass seed is used per 1 dm of the square area?

Correct answer:

m =  8.8357 kg

Step-by-step explanation:

r=15 m φ=45   S1=π r2=3.1416 152706.8583 m2 S2=360φ S1=36045 706.858388.3573 m2  S3=S2 dm2=S2 100  dm2=88.3573 100  dm2=8835.72934 dm2  σ=1 g/dm2 m1=S3 σ=4844276493 1=4844276493 1=48442764938835.7293 g  m=m1 kg=m1:1000  kg=8835.7293:1000  kg=8.836 kg=8.8357 kg

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