A cylindrical pillar of height 7.5 m and diameter 3.5 m is to be painted. At the top and bottom, 25 cm of the pillar is covered by brass plates and the remaining portion is to be painted. Find the area of the pillar which
to be painted .
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Answer:
76.93 m.sq.
Step-by-step explanation:
50 cm(0.5 m) should not be painted(25 in top and 25 in bottom)
height to be painted = 7.5 -0.5 = 7 m
radius = 3.5/2 = 1.75 m
Area to be painted = curved surface area excluding 0.5 m
= 2 * 3.14 * 1.75 * 7
= 76.93 m.sq.
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Area with base=25+25=50cm
=0•5cm
Height of the pillar=7•5cm
Height of the pillar will be painted
2 pi rh =2×22 ×35 ×7
7 10×2
770 =77m²
10
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