PM 發問於 科學及數學數學 · 1 十年前

F.2 MATHS volume of cylinder

The figure shows a cylindrical glass whose outer diameter is 10cm and inner diameter is 9cm . If the height of the glass is 20cm and its thickness is uniform ( including the base), find the volume of material used for making this glass ?

Help me pls

1 個解答

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  • 1 十年前
    最愛解答

    Thickness of the glass = (10 - 9)/2 = 0.5 cm

    Volume of the material used

    = Volume of the big cylinder - Volume of the small cylinder

    = piR^2H - pir^2h

    = pi[(10/2)^2(20)] - pi[(9/2)^2(20 - 0.5)]

    = (841pi/8) cm^3

    資料來源: Physics king
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