in a building there are 24 cylindrical pillar ·The radius of each pillar is 28 cm and height is 4m ·find the total cost painting the curved surface area of all pillars at the rate Rs ·8per m²
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Answered by
1
Answer:
1.35168 Rs
Step-by-step explanation:
CSA = 2πrh
=2×22/7×28×4
=704cm²
total area to be painted= 24×704
= 16897cm
cost= .8×16897/10000
= 1.35168 Rs
Answered by
1
Base radius of pillar = 28cm = 0.28m
Height = 4m
=> CSA of one pillar = 2πrh
= 2 × 22/7 × 0.28 × 4
= 2 × 0.88 × 4
= 1.76 × 4
= 7.04m²
Rate of painting pillars = ₹8 per m²
=> Cost of painting one pillar = ₹( 7.04 × 8)
= ₹ 56.32
Total cost of painting 24 pillars = ₹( 56.32 × 24 )
= ₹ 1351.68
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