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High School Math : Pre-Algebra

Study concepts, example questions & explanations for High School Math

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8 Diagnostic Tests 613 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #652 : High School Math

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

Possible Answers:

$30\pi$

$15\pi$

Correct answer:

$30\pi$

Explanation:

To find the circumference of a circle given the radius we must first know the equation for the circumference of a circle which is

We then plug in the number for the radius into the equation yielding $C=2(\pi)(15)$

We multiply to find the value for the circumference is $30\pi$ .

The answer is $30\pi$ .

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Example Question #2 : How To Find The Circumference Of A Circle In Pre Algebra

What is the circumference of a circle with radius ?

Possible Answers:

$3\pi$

$1.5\pi$

$12\pi$

$6\pi$

$8\pi$

Correct answer:

$6\pi$

Explanation:

Remember, the formula for circumference of a circle is $C=2\pi r$ .

Plug in our given values:

$C=2\pi r$

$C=2\pi*3$

$C=6\pi$

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Example Question #5 : How To Find The Circumference Of A Circle In Pre Algebra

If the circumference of a circle is $8\pi$ , what is the radius of the circle?

Possible Answers:

$\sqrt{8}$

Correct answer:

Explanation:

The formula for the circumference of a circle is $C=2\pi r$ .

The problem gives us the circumference, so plug that in:

$8\pi=2\pi r$

Notice that the $\pi$ 's cancel out:

8=2r

Divide both sides by :

$\frac{8}{2}=r$

4=r

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Example Question #32 : Perimeter Of A Figure

If the circumference of a circle is $8\pi$ , what is the diameter of the circle?

Possible Answers:

Correct answer:

Explanation:

The diameter of the circle is twice the radius, or d=2r . We first need to find the radius using the information that has been given to us.

The formula for the circumference of a circle is $C=2\pi r$ .

The problem gives us the circumference, so plug that in:

$8\pi=2\pi r$

Notice that the $\pi$ 's cancel out:

8=2r

Divide both sides by :

$\frac{8}{2}=r$

4=r

Plug that into our first equation:

d=2r

d=2*4

d=8

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Example Question #7 : How To Find The Circumference Of A Circle In Pre Algebra

If the diameter of a circle is , what is the circumference?

Possible Answers:

$14\pi$

$49\pi$

$196\pi$

$28\pi$

$7\pi$

Correct answer:

$14\pi$

Explanation:

The formula for circumference is $C=2\pi r$ . The problem gives us the diameter instead of the radius, so we need to convert.

The diameter is twice the radius or d=2r .

This means that, for this circle, 14=2r .

Divide both sides by :

$\frac{14}{2}=r$

7=r

Plug this value into our initial equation to solve:

$C=2\pi r$

$C=2\pi *7$

$C=14\pi$

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Example Question #8 : How To Find The Circumference Of A Circle In Pre Algebra

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

Possible Answers:

$5\pi$

$10\pi$

$\frac{5}{2}\pi$

$\frac{25}{2}\pi$

$25\pi$

Correct answer:

$10\pi$

Explanation:

The formula for circumference of a circle is $C=2\pi r$ .

Plug in our given information and solve.

$C=2\pi r$

$C=2\pi *5$

$C=10\pi$

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Example Question #9 : How To Find The Circumference Of A Circle In Pre Algebra

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

Possible Answers:

$12\pi$

$60\pi$

$\frac{1}{6}\pi$

$36\pi$

$6\pi$

Correct answer:

$12\pi$

Explanation:

The formula for circumference of a circle is $C=2\pi r$ .

Plug in our given values.

$C=2*\pi*6$

$C=12\pi$

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Example Question #391 : Pre Algebra

What is the circumference of a circle with radius of ?

Possible Answers:

$2\pi$

$6\pi$

$9\pi$

$27\pi$

$\frac{1}{3}\pi$

Correct answer:

$6\pi$

Explanation:

The formula for circumference of a circle is $C=2\pi r$ .

Plug in our given values.

$C=2*\pi*3$

$C=6\pi$

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Example Question #11 : How To Find The Circumference Of A Circle In Pre Algebra

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

Possible Answers:

$13\pi$

$11\pi$

$22\pi$

$\frac{1}{11}\pi$

$121\pi$

Correct answer:

$22\pi$

Explanation:

The formula for circumference of a circle is $C=2\pi r$ .

Plug in our given values.

$C=2*\pi*11$

$C=22\pi$

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Example Question #661 : High School Math

What is the circumference of a circle with a radius of 2.5 ?

Possible Answers:

$12.5\pi$

$3\pi$

$2.5\pi$

$\pi$

$5\pi$

Correct answer:

$5\pi$

Explanation:

The formula for the circumference is $C=2\pi r$ .

Plug in our given radius and solve.

$C=2\pi r$

$C=2*\pi* 2.5$

$C=5\pi$

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High School Math : Pre-Algebra

Study concepts, example questions & explanations for High School Math

All High School Math Resources

Example Questions

Example Question #652 : High School Math

Example Question #2 : How To Find The Circumference Of A Circle In Pre Algebra

Example Question #5 : How To Find The Circumference Of A Circle In Pre Algebra

Example Question #32 : Perimeter Of A Figure

Example Question #7 : How To Find The Circumference Of A Circle In Pre Algebra

Example Question #8 : How To Find The Circumference Of A Circle In Pre Algebra

Example Question #9 : How To Find The Circumference Of A Circle In Pre Algebra

Example Question #391 : Pre Algebra

Example Question #11 : How To Find The Circumference Of A Circle In Pre Algebra

Example Question #661 : High School Math

All High School Math Resources

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