Call Now to Set Up Tutoring:

(888) 888-0446

High School Math : How to find the area of a circle in pre-algebra

Study concepts, example questions & explanations for High School Math

Create An Account

All High School Math Resources

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

Example Questions

Example Question #1 : How To Find The Area Of A Circle In Pre Algebra

What is the area of circle with a radius of ?

Possible Answers:

$18\pi$

$9\pi$

$81\pi$

Correct answer:

$81\pi$

Explanation:

To find the area of a circle you must plug the radius into in the following equation

In this case the radius is so we plug it into to get $9^{2}=81$

We then multiply it by $\pi$ to get our answer $A=81\pi$ .

Report an Error

Example Question #1 : How To Find The Area Of A Circle In Pre Algebra

What is the area of a circle with radius of ?

Possible Answers:

$9\pi$

$2\pi$

$3\pi$

$27\pi$

$6\pi$

Correct answer:

$9\pi$

Explanation:

The formula for the area of a circle is $A=\pi r^2$ .

Plug in our given values:

$A=\pi r^2$

$A=\pi*3^2$

$A=9\pi$

Report an Error

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

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

Possible Answers:

$2\pi$

$16\pi$

$32\pi$

$4\pi$

$8\pi$

Correct answer:

$16\pi$

Explanation:

The formula for the area of a circle is $A=\pi r^2$ .

Plug in the information given and solve:

$A=\pi * 4^2$

Remember, a number squared is just the same as that number times itself:

$A=\pi*(4*4)$

$A=16\pi$

Report an Error

Example Question #4 : How To Find The Area Of A Circle In Pre Algebra

If the area of a circle is $64\pi$ , what is the radius of the circle?

Possible Answers:

Correct answer:

Explanation:

The formula for the area of a circle is $A=\pi r^2$ .

Plug in the information given and solve:

$64\pi = \pi r^2$

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

64=r^2

Take the square root of both sides:

$\sqrt{64}=\sqrt{r^2}$

8=r

Report an Error

Example Question #57 : Area Of A Figure

If the diameter of a circle is , what is the area of that circle?

Possible Answers:

$484\pi$

$121\pi$

$11\pi$

$22\pi$

$66\pi$

Correct answer:

$121\pi$

Explanation:

The area of a circle is $A=\pi r^2$ , but the problem gives us the diameter and not the radius.

The diameter is twice the radius, so d=2r . We can plug in our given values to find the radius:

22=2r

$\frac{22}{2}=r$

11=r

Now we can plug this value into our equation for area:

$A=\pi r^2$

$A=\pi*11^2$

$A=\pi *121$

$A=121\pi$

Report an Error

Example Question #58 : Area Of A Figure

If the area of a circle is $36\pi$ , what is the length of the radius?

Possible Answers:

Correct answer:

Explanation:

The formula for the area of a circle is $A=\pi r^2$ . Plug in our given information to solve:

$A=\pi r^2$

$36\pi=\pi r^2$

The $\pi$ 's cancel out, leaving us with:

36=r^2

Take the square root of both sides:

$\sqrt{36}=\sqrt{r^2}$

6=r

Report an Error

Example Question #1 : How To Find The Area Of A Circle In Pre Algebra

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

Possible Answers:

$\frac{5}{\pi}$

$10\pi$

$25\pi$

$5\pi$

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

Correct answer:

$25\pi$

Explanation:

The formula for area of a circle is $A=\pi r^2$ .

Plug in our given information:

$A=\pi*5^2$

$A=25\pi$

Report an Error

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

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

Possible Answers:

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

$12\pi$

$36\pi^2$

$36\pi$

$6\pi$

Correct answer:

$36\pi$

Explanation:

The formula for area of a circle is $A=\pi r^2$ .

Plug in our given information:

$A=\pi 6^2$

$A=36\pi$

Report an Error

Example Question #3 : How To Find The Area Of A Circle In Pre Algebra

What is the area of a circle with a diameter of ?

Possible Answers:

$484\pi$

$22\pi$

$11\pi$

$11\pi^2$

$121\pi$

Correct answer:

$121\pi$

Explanation:

The formula for area of a circle is $A=\pi r^2$ . However, the problem gives us the diameter instead of the radius. The diameter is twice the length of the radius:

d=2r

22=2r

$\frac{22}{2}=r$

11=r

We can plug that back into our area equation:

$A=\pi r^2$

$A=\pi *11^2$

$A=121\pi$

Report an Error

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

What is the area of a circle with a diameter of ?

Possible Answers:

$12\pi$

$144\pi$

$\frac{1}{2}\pi$

$6\pi$

$36\pi$

Correct answer:

$36\pi$

Explanation:

The formula for area of a circle is $A=\pi r^2$ . However, the problem gives us the diameter instead of the radius. The diameter is twice the length of the radius:

d=2r

12=2r

$\frac{12}2{}=r$

6=r

We can plug that back into our original equation and solve:

$A=\pi r^2$

$A=\pi *6^2$

$A=36\pi$

Report an Error

View Tutors

Ronald
Certified Tutor

Towson University, Master of Science, Counseling Psychology.

View Tutors

Jonathan
Certified Tutor

East Carolina University, Bachelor of Science, Chemistry. East Carolina University, Bachelor of Science, Biology, General.

View Tutors

Constance
Certified Tutor

Loyola University-Chicago, Bachelors, Psychology. Sam Houston State University, Masters, Counseling Psychology.

All High School Math Resources

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

Popular Subjects

Algebra Tutors in Denver, GRE Tutors in Chicago, French Tutors in Houston, GMAT Tutors in Boston, Physics Tutors in San Francisco-Bay Area, Algebra Tutors in Boston, Spanish Tutors in Seattle, English Tutors in Phoenix, Biology Tutors in Dallas Fort Worth, Biology Tutors in Washington DC

Popular Courses & Classes

ISEE Courses & Classes in Phoenix, Spanish Courses & Classes in Miami, SAT Courses & Classes in Boston, LSAT Courses & Classes in Phoenix, LSAT Courses & Classes in Atlanta, GMAT Courses & Classes in Atlanta, MCAT Courses & Classes in New York City, Spanish Courses & Classes in New York City, ACT Courses & Classes in San Francisco-Bay Area, Spanish Courses & Classes in Philadelphia

Popular Test Prep

GRE Test Prep in New York City, GMAT Test Prep in Atlanta, ACT Test Prep in San Francisco-Bay Area, LSAT Test Prep in Miami, MCAT Test Prep in Los Angeles, SAT Test Prep in Boston, MCAT Test Prep in Washington DC, MCAT Test Prep in Seattle, SAT Test Prep in Houston, GRE Test Prep in Seattle

DMCA Complaint

If you believe that content available by means of the Website (as defined in our Terms of Service) infringes one or more of your copyrights, please notify us by providing a written notice (“Infringement Notice”) containing the information described below to the designated agent listed below. If Varsity Tutors takes action in response to an Infringement Notice, it will make a good faith attempt to contact the party that made such content available by means of the most recent email address, if any, provided by such party to Varsity Tutors.

Your Infringement Notice may be forwarded to the party that made the content available or to third parties such as ChillingEffects.org.

Please be advised that you will be liable for damages (including costs and attorneys’ fees) if you materially misrepresent that a product or activity is infringing your copyrights. Thus, if you are not sure content located on or linked-to by the Website infringes your copyright, you should consider first contacting an attorney.

Please follow these steps to file a notice:

You must include the following:

A physical or electronic signature of the copyright owner or a person authorized to act on their behalf; An identification of the copyright claimed to have been infringed; A description of the nature and exact location of the content that you claim to infringe your copyright, in \ sufficient detail to permit Varsity Tutors to find and positively identify that content; for example we require a link to the specific question (not just the name of the question) that contains the content and a description of which specific portion of the question – an image, a link, the text, etc – your complaint refers to; Your name, address, telephone number and email address; and A statement by you: (a) that you believe in good faith that the use of the content that you claim to infringe your copyright is not authorized by law, or by the copyright owner or such owner’s agent; (b) that all of the information contained in your Infringement Notice is accurate, and (c) under penalty of perjury, that you are either the copyright owner or a person authorized to act on their behalf.

Send your complaint to our designated agent at:

Charles Cohn Varsity Tutors LLC
101 S. Hanley Rd, Suite 300
St. Louis, MO 63105

Or fill out the form below:

Do not fill in this field

Contact Information

* Full legal name

Company name

* Phone number

* Email address

Address

* Address1

Address2

* City

* State

* Zipcode

* Country

Complaint Details

* URL of copyrighted work (where your original material is located)

* Please describe the copyrighted work so that it may be easily identified

I am the owner, or an agent authorized to act on behalf of the owner of an exclusive right that is allegedly infringed.

I have a good faith belief that the use of the material in the manner complained of is not authorized by the copyright owner, its agent, or the law.

This notification is accurate.

I acknowledge that there may be adverse legal consequences for making false or bad faith allegations of copyright infringement by using this process.

* Signature (your digital signature is legally binding)

HIGH SCHOOL

GRADUATE SCHOOL

K-8

Search 50+ Tests

math tutoring

science tutoring

foreign languages

elementary tutoring

other

Search 350+ Subjects

High School Math : How to find the area of a circle in pre-algebra

Study concepts, example questions & explanations for High School Math

All High School Math Resources

Example Questions

Example Question #1 : How To Find The Area Of A Circle In Pre Algebra

Example Question #1 : How To Find The Area Of A Circle In Pre Algebra

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

Example Question #4 : How To Find The Area Of A Circle In Pre Algebra

Example Question #57 : Area Of A Figure

Example Question #58 : Area Of A Figure

Example Question #1 : How To Find The Area Of A Circle In Pre Algebra

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

Example Question #3 : How To Find The Area Of A Circle In Pre Algebra

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

All High School Math Resources

Report an issue with this question

DMCA Complaint

Contact Information

Address

Complaint Details

Email address:
Your name:
Feedback: