Multiple choice

In a building there are $10$ cylindrical pillars . The radius of each pillar is $63$ cm and height is $15$ m. Find curved surface area of four pillars.

  1. $\displaystyle 22016{\  m }^{ 2 }$
  2. $\displaystyle 237.6{\  m }^{ 2 }$
  3. $\displaystyle 2476{\  m }^{ 2 }$

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Curved surface area of one cylinder = 2 * pi * r * h. r = 0.63 m, h = 15 m. Area = 2 * (22/7) * 0.63 * 15 = 2 * 22 * 0.09 * 15 = 59.4 m^2. For four pillars, area = 4 * 59.4 = 237.6 m^2.

AI explanation

Convert the pillar radius to meters to get 0.63 m and use the curved surface area formula for a cylinder, which is 2 pi r h. For one pillar, the area is 2 * (22/7) * 0.63 * 15, yielding 59.4 square meters. Multiplying this by 4 gives the total curved surface area for the four pillars, resulting in 237.6 square meters.

Keep practicing — related questions