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anonymous

  • 4 years ago

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.

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  1. anonymous
    • 4 years ago
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    area = pi*r^2 area = pi*6^2 area=36pi m^2 weed killer = (20 ml )(36 pi m^2)

  2. anonymous
    • 4 years ago
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    720 ml

  3. anonymous
    • 4 years ago
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    oops forgot the pi

  4. anonymous
    • 4 years ago
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    20*36*pi = answer in ml

  5. anonymous
    • 4 years ago
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    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

  6. anonymous
    • 4 years ago
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    technically 2262 if you use full pi

  7. anonymous
    • 4 years ago
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    and dont round till the end like you're supposed to

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