maths-surface area

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A cone 7dm high and 6 dm in diameter is placed on the ground. Sand is poured over it until conical heap 21 dm high and 33 dm circumference at the bottom is formed. Find how many m^3 of sand is there?

  • maths-surface area -

    volume of cone is 1/3 pi r^2 h

    subtract the small cone from the large cone

    That's how much is sand.

  • maths-surface area -

    what about 33dm circumfernce

  • maths-surface area(STEVE SIR) -

    what about 33dm circumfernce

  • maths-surface area -

    well, you know that C = 2pi r, so,

    r = 33/2pi

    Forgot about that?

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