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5. There are 20 cylindrical pillars in a building, each having a diameter of
50 cm and height 4 m. Find the cost of cle

By Bella

5. There are 20 cylindrical pillars in a building, each having a diameter of
50 cm and height 4 m. Find the cost of cleaning them at 14 per m^2​

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Bella

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Vaibhav is an enthusiastic sports boy. While practicing long jump, he managed 90 cm on
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2 thoughts on “<br />5. There are 20 cylindrical pillars in a building, each having a diameter of<br />50 cm and height 4 m. Find the cost of cle”

  1. Answer:

    Rs 1760

    Step-by-step explanation:

    Radius of 1 pillar = 50/2 cm

    = 25 cm = 0.25 m

    Curved surface of 1 pillar is 2πrh

    = 2 x (22/7) x (0.25) x 4 m²

    = 44/7 m²

    ∴ Curved surface area of 20 such pillars 20 x 44/7 m² = 880/7 m²

    Cost of cleaning = rate x area

    = Rs 14 x (880/7)

    = Rs 1760

    Reply

  2. ____________________________________

    Given :-

    • Radius of 1 pillar = 50/2 cm

    ⟹ 25 cm = 0.25 m

    • Curved surface of 1 pillar is 2πrh

    ⟹ 2 x (22/7) x (0.25) x 4 m²

    ⟹ 44/7 m²

    Therefore, Curved surface area of 20 such pillars 20 x 44/7 m² = 880/7 m².

    ____________________________________

    Answer :-

    • Cost of cleaning = rate x area

    ⟹ Rs 14 x (880/7)

    ⟹ Rs 1760

    ____________________________________

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    Reply

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