Question

What is the surface area if this sphere?

Answer 1

The surface area of the sphere is approximately equal to 379.9 square centimetres.

Explanation:

The surface are a of a sphere with respect to radius is 4πr². We're given the diameter, of 11 cm, so we know that the radius is 5.5 cm.

With that we can find the surface area:

`a = 4\pi r^2\\a = 4\pi (5.5cm)^2\\a = 4\pi * 30.25cm^2\\a = \pi * 121cm^2\\a \approx 3.14 * 121cm^2\\a \approx 379.9cm^2`