geometry

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jo was comparing two cylinders that both had a radius of 5cm. the first had a height of 10cm, and the other a height of 20cm. How many times greater was the volume of the larger cylinder?

  • geometry -

    V = pi * r^2 * h
    V = 3.14 * 5^2 + 10
    V = 3.14 * 25 * 10
    V = 785 square cm

    That's the smaller cylinder.

    Find the volume of the larger cylinder and then subtract.

    http://www.mathsteacher.com.au/year9/ch14_measurement/18_cylinder/cylinder.htm

  • geometry - correction -

    The volume of the smaller cylinder is 785 cubic centimeters.

  • geometry -

    v1 = pi r^2 H1
    v2 = pi r^2 H2

    v2/v1 = H2/H1 - twice

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