Math

A solid S is made up of a cylindrical part and conical part. The height of the Soild is 4.5m. The common radius of the cylindrical part and the conical part is 0.9m. The height of the conical part is 1.4m.
a. Calculate the volume,correct to 1 decimal place,of soild S.

b. Calculate the total surface area of soild S.

c. A square base pillar offside 1.6m has the same volume as soild S. Determine the height of the pillar, correct to 1 decimal place.

If I know how to do it. I will not post

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asked by Kd
  1. sigh.
    (a) v = π * 0.9^2 * 3.1 + 1/3 * π * 0.9^2 * 1.4
    (b) a = π * 0.9^2 + 2π * 0.9 * 3.1 + π * 0.9 * √(0.9^2 + 1.4^2)
    (c) 1.6^2 * h = (volume from (a))

    Just use your basic formulas for volume and area ...

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    posted by Steve

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