Multiple choice

The radius of a roller is 0.7 m and it is 2 m long How much area will it cover in 10 revolutions?

  1. $\displaystyle 88m^{2}$
  2. $\displaystyle 78m^{2}$
  3. $\displaystyle 80m^{2}$
  4. $\displaystyle 70m^{2}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Area covered in one revolution = circumference * length = (2 * pi * r) * h. Area = 2 * (22/7) * 0.7 * 2 = 8.8 m^2. In 10 revolutions, area = 88 m^2.

AI explanation

The area covered in one revolution equals the curved surface area of the cylinder, which is found by the formula 2*pi*r*h. Substituting the given values gives 2*(22/7)*0.7*2 = 8.8 square m. For 10 revolutions, the total area is 8.8 multiplied by 10. The result is 88 square m.

Keep practicing — related questions