High School Math : Perimeter of a Figure

Study concepts, example questions & explanations for High School Math

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Example Questions

Example Question #51 : Geometry

What is the circumference of a circle with a radius of ?

Possible Answers:

Correct answer:

Explanation:

The formula for the circumference of a circle is .

Plug in our given values and solve.

Example Question #51 : Perimeter Of A Figure

What is the circumference of a circle with a radius of ?

Possible Answers:

Correct answer:

Explanation:

To find the circumference of a circle, use the equation:

Substitute the given value for the radius into the equation:

Example Question #52 : Perimeter Of A Figure

An ant is standing at the center of a perfectly circular plate. If the ant crawled in a straight line, he would have to crawl 6 inches to reach the edge of the plate. How many inches would he crawl if he crawled a full circle around the edge of the plate?

Possible Answers:

Correct answer:

Explanation:

We need to find the circumference:

In this formula  stands for the radius and  stands for the diameter. 

The distance the ant must crawl to the edge from the center is the radius of the circle.

Plug in 6 inches for :

Example Question #53 : Perimeter Of A Figure

If a circle has a radius of meters, what is its circumference? 

Possible Answers:

Correct answer:

Explanation:

The formula for the circumference of a circle is , where  is the diameter. This can also be written as , where  is the radius of the circle. We were given the radius, so we take the second formula and plug in  for .

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