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Geometry Worksheets - Surface of Sphere

Objective: I know how to calculate the surface area of a sphere.

The surface area of a sphere is given by the formula:

V = 4πr2

If you are given the diameter, remember to first divide the diameter by 2 to get the radius before using the formula.

Read this lesson on the surface area of spheres if you need additional help.


Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Find the surface areas of the following spheres.
Take π = 3.14
Give your answer to the nearest tenths.
(Remember to include the relevant unit in your answer)

diameter = 4 cm
surface area =

radius = 10 ft
surface area =

diameter = 36 m
surface area =

radius = 5 in
surface area =

diameter = 43 mm
surface area =

radius = 21 yd
surface area =

radius = 11 in
surface area =

diameter = 14 yd
surface area =

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