Multiple choice

Radius of a sphere is 3 cm. What will be the surface area of the new sphere, if radius is doubled? (Use pi = 3.14)

  1. 434.39 cm2

  2. 444.93 cm2

  3. 449.39 cm2

  4. 452.16 cm2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Original radius = 3, new radius = 6. Surface area = 4 * pi * r^2 = 4 * 3.14 * 6^2 = 4 * 3.14 * 36 = 452.16.

AI explanation

If the original radius of 3 centimeters is doubled, the new radius becomes 6 centimeters. Using the surface area of a sphere formula, the area is four multiplied by pi and the radius squared, giving 4 times 3.14 times 36, which equals 452.16 square centimeters.

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