ISEE Upper Level Math : How to find the surface area of a sphere

Study concepts, example questions & explanations for ISEE Upper Level Math

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Example Questions

Example Question #411 : Geometry

Find the surface area of a sphere with a diameter of 12in.

Possible Answers:

Correct answer:

Explanation:

To find the surface area of a sphere, we will use the following formula:

where r is the radius of the sphere.

Now, we know the diameter of the sphere is 12in. We also know the diameter is two times the radius. Therefore, the radius is 6in. So, we get

Example Question #21 : Spheres

A spherical buoy has a radius of  meters. What is the surface area of the buoy?

Possible Answers:

Correct answer:

Explanation:

A spherical buoy has a radius of 5 meters. What is the surface area of the buoy?

To find the surface area of a sphere, use the following:

Plug in our radius and solve!

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