Sphere Surface Area Math Example 4

Follow the full solution, then compare it with the other examples linked below.

easy

A basketball has a diameter of

24

cm. Find its surface area.

1
Step 1: The radius is $r = \frac{24}{2} = 12$ cm.
2
Step 2: $SA = 4\pi r^2 = 4\pi(12)^2 = 4\pi(144) = 576\pi \approx 1809.56$ cm².

Answer

SA = 576\pi \approx 1809.56

cm²

Always convert diameter to radius first (

r = d/2 = 12

cm). Then apply

SA = 4\pi r^2 = 4(144)\pi = 576\pi

cm².

About Sphere Surface Area

The total area covering the curved outer surface of a sphere, given by the formula

S = 4\pi r^2

Find the surface area of a sphere with radius [formula] cm.

A sphere has a surface area of [formula] cm². Find its radius and volume.

Find the surface area of a sphere with diameter 10 cm.

Two spheres have radii in the ratio [formula]. Find the ratio of their surface areas. If the smaller