Multiple choice

The total surface area of a hemisphere of radius 10 cm is

  1. 942.86cm²

  2. 900cm²

  3. 300cm²

  4. 592.86cm²
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Total surface area of a hemisphere = 3 * pi * r^2. Area = 3 * 3.14159 * 10^2 = 3 * 3.14159 * 100 = 942.477. Option A is the closest value.

AI explanation

Using the total surface area formula for a hemisphere, 3 times pi times radius squared, we substitute the given radius. With a radius of 10 cm and pi approximated as 22/7, the calculation becomes 3 times 22/7 times 10 squared. This simplifies to 6600 divided by 7, which equals approximately 942.86 cm2. The result is 942.86cm².

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