Question

Verandah of a school is supported by 10 pillars.each pillar is 4 m high and its daimaeter is 63 cm.how much concrete mixture is required to construct the pillars? The csa is to be washed.calculate the area to be washed.

Answer 1

csa of cylinder = πdh

= 22/7×63×400

= 79,200 cm²

total area to be white washed is 79,200×10 = 7,92,000

Answer 2

The concrete mixture is required to construct the pillars is 1.2474 cubic m and The curved surface area of pillar is 3.9722 sq.m.

Step-by-step explanation:

Height of each pillar = 4 m

Diameter of pillar = 63 cm = 0.63 m

Radius of pillar = $\frac{0.63}{2}=0.315 m$

Volume of 1 pillar =$\pi r^2 h = \frac{22}{7} \times 0.315^2 \times 4 =1.2474 m^3$

Volume of 10 pillars =$1.247 \times 10 =12.47 m^3$

Curved surface area of pillar =$\pi r \sqrt{h^2+r^2}=\frac{22}{7} \times 0.315 \times \sqrt{4^2+0.315^2}=3.9722 m^2$

Hence The concrete mixture is required to construct the pillars is 1.2474 cubic m and The curved surface area of pillar is 3.9722 sq.m.

#Learn more:

In a building there are 24 cylindrical pillars . The radius of each pillar is 28cm and height is 4m. how much concrete mixture would be required to build all these pillars

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