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This math question i really dont get ...

A city park contains a cylindrical artificial pond that has a radius of 7.5 m. A 2 m concrete deck will be constructed around the pond. The concrete should be at least 15 cm thick. Calculate the minimum volume of concrete required to construct the deck, to one decimal place. Draw a diagram.

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  1. 5 May, 19:20
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    Diagram below

    ok so what you do is find area of total-areapond=areaaround

    then times that by the height

    areatotal=pir^2

    r=7.5+2=9.5

    aeratotal=pi9.5^2=90.25pi

    areapond=pi7.5^2=56.25pi

    areaaround=90.25pi-56.25pi=34pi

    volume=area times height

    34pi m^2

    15 cm thick

    convert 15cm to m

    0.15m

    34pi times 0.15=5.1pim^3=16.02m^3

    volume=16.0 m^3

    if converted to cm

    v=16022122.5 cm^3
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