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Multiple choice

The volume of a cone is $462$ m$^3$. Its base radius is $7$ m. Find its height.

  1. $6$
  2. $7$
  3. $8$
  4. $9$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Volume of cone = (1/3) * pi * r^2 * h. 462 = (1/3) * (22/7) * 7^2 * h. 462 = (1/3) * 22 * 7 * h. 462 = 154/3 * h? No, 462 = (22 * 7 / 3) * h => 462 = 154/3 * h => h = 462 * 3 / 154 = 9.

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