Question

In a building there are 20 cylindrical pillars. the radius of each pillars is 35 cm and height is 4m . find the total cost of painting all pillars at the rate of rs 10 per m2 ( m square )

Answer 1

Answer:

r = 35 cm = 0.35 m

h = 4 m

CSA of 1 cylindrical pillar =

$2\pi \: rh \\ = 2 \times \frac{22}{7} \times 0.35 \times 4 \\ \\ = 2 \times \frac{22}{7} \times \frac{35}{100} \times 4 \\ \\ = 8.8 \: {m}^{2}$

CSA of 20 cylindrical pillars =

$= 20 \times 8.8 \\ = 176 \: {m}^{2}$

Cost of 1 sq.m is Rs.10.

Cost of 176 sq.m is Rs.10x176 = Rs. 1760

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Answer 2

Answer:

See the attachment !

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