Multiple choice

The volume of a solid hemisphere is numerically equal to its total surface area. Its radius is

  1. 4.5 units

  2. 1.5 units

  3. 9 units

  4. 3 units
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Volume of hemisphere = (2/3) * pi * r^3. Total surface area = 3 * pi * r^2. Equating: (2/3) * pi * r^3 = 3 * pi * r^2. Dividing by pi * r^2: (2/3) * r = 3, so r = 9/2 = 4.5.

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