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Multiple choice

The radius of a right circular cylinder is increased by 10% and its height is reduced by 10%. What will be the change in its volume?

  1. 5.2

  2. 8.9

  3. 15.2

  4. 10.2

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Original volume = πr^2h. New volume = π(1.1r)^2(0.9h) = πr^2h × 1.21 × 0.9 = πr^2h × 1.089. Change = 8.9% increase. Option B is correct.

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