Multiple choice

A metal pipe is $77$ cm long The inner diameter of a cross section is $4$ cm then inner curved surface area is

  1. $900$ $\displaystyle cm^{2}$
  2. $960$ $\displaystyle cm^{2}$
  3. $968$ $\displaystyle cm^{2}$
  4. $964$ $\displaystyle cm^{2}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Inner curved surface area = 2 * pi * r * h. Diameter = 4, so r = 2. h = 77. Area = 2 * (22/7) * 2 * 77 = 2 * 22 * 2 * 11 = 968.

AI explanation

The inner curved surface area of a cylinder is calculated using the formula 2 * pi * r * h, where r is the inner radius and h is the length. Given the inner diameter is 4 cm, the radius r is 2 cm, and the length h is 77 cm. Substituting these values gives 2 * (22 / 7) * 2 * 77, which equals 88 * 11, resulting in 968 cm^2.

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