14. The interior of a building is in the form of a right
circular cylinder of diameter 4.2 m and height 4 m
surmounted by a cone. The vertical height of the
cone is 2.1 m. Find the outer surface area and volume
of the building.
Answers
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outer surface area=cs a of con e +cs a of cylinder
= πrl +2πrh
I=vh 2+ r2=v2.1^2+2.1^2 =v4.41+441 = v8.82 = 2.97 m
OSA= πrl +2πrh=πx2.1x2.97 +
2πx2.1x4=23.037π
= 72.3m2. Ans(OSA)
VOLUME
πr 2h +1/3πr 2h
πx2.1^2 x 4 + 1/3πx2.1^2 x 2.1
= 17.64 π +3.087π = 20.727πm3
= 65.08m3. Ans
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