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Maths P1 Nov 2005 Q5(i)
- Thread starter haris
- Start date
PlanetMaster
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First see the image in 2-Dimension just as it is in question.
Using similar triangles:
..r.....=...6.
12-h......12
So h =12−2r
Now come to 3-Dimension.
Vol of cylinder = πr²h
Vol of cylinder = πr²(12-2r)
Vol of cylinder = 12πr² - 2πr³ (Shown)
Using similar triangles:
..r.....=...6.
12-h......12
So h =12−2r
Now come to 3-Dimension.
Vol of cylinder = πr²h
Vol of cylinder = πr²(12-2r)
Vol of cylinder = 12πr² - 2πr³ (Shown)