anonymous
  • anonymous
Patrick is using a weed killer to treat his circular lawn which a diameter of 12 metres. The weed killer instructions say to use 20 ml for every square metre of lawn to be treated. How much weed killer does he need to use? Give your answer to the nearest ml.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
area = pi*r^2 area = pi*6^2 area=36pi m^2 weed killer = (20 ml )(36 pi m^2)
anonymous
  • anonymous
720 ml
anonymous
  • anonymous
oops forgot the pi

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anonymous
  • anonymous
20*36*pi = answer in ml
anonymous
  • anonymous
diameter = 12m ==> radius = 6m area of circle = πr^2 = 3.14 * (6m)^2 = 3.14*36m^2 = 113.04m^2 for 1 m^2 area wed killer required = 20 ml so for 113.04m^2 area, weed killer required = (20 * 113.04) ml = 2260.8 ml = 2261 ml
anonymous
  • anonymous
technically 2262 if you use full pi
anonymous
  • anonymous
and dont round till the end like you're supposed to

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