High School Math : How to find the radius of a sphere

Study concepts, example questions & explanations for High School Math

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Example Questions

Example Question #1 : How To Find The Radius Of A Sphere

Find the radius of a sphere whose surface area is .

Possible Answers:

Not enough information to solve

Correct answer:

Explanation:

We know that the surface area of the spere is .

Rearrange and solve for .

Example Question #2 : How To Find The Radius Of A Sphere

What is the radius of a sphere that has a surface area of ?

Possible Answers:

Correct answer:

Explanation:

The standard equation to find the area of a sphere is  where  denotes the radius. Rearrange this equation in terms of :

To find the answer, substitute the given surface area into this equation and solve for the radius:

Example Question #3 : How To Find The Radius Of A Sphere

Given that the volume of a sphere is , what is the radius?

Possible Answers:

Correct answer:

Explanation:

The standard equation to find the volume of a sphere is 

where  denotes the radius. Rearrange this equation in terms of :

Substitute the given volume into this equation and solve for the radius:

Example Question #4 : How To Find The Radius Of A Sphere

What is the radius of a sphere with a volume of ?

Possible Answers:

Correct answer:

Explanation:

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