We are open Saturday and Sunday!

Call Now to Set Up Tutoring:

(888) 888-0446

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

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

Create An Account

All ISEE Upper Level Math Resources

6 Diagnostic Tests 244 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #11 : How To Find The Area Of A Circle

What is the area of a circle with a diameter of , rounded to the nearest whole number?

Possible Answers:

$\dpi{100} 64$

$\dpi{100} 254$

$\dpi{100} 255$

$\dpi{100} 81$

Correct answer:

$\dpi{100} 64$

Explanation:

The formula for the area of a circle is

$\dpi{100} \pi r^{2}$

Find the radius by dividing 9 by 2:

$\dpi{100} \frac{9}{2}=4.5$

So the formula for area would now be:

$\dpi{100} \pi r^{2}=\pi (4.5)^{2}=20.25\pi \approx 63.6= 64$

Report an Error

Example Question #11 : Radius

A circle has a radius of 5 miles, what is its area?

Possible Answers:

$10 \pi mi^2$

$25 \pi mi^2$

$250 \pi mi^2$

$125 \pi mi^2$

Correct answer:

$25 \pi mi^2$

Explanation:

A circle has a radius of 5 miles, what is its area?

Find the area of a circle with the following formula:

$A_{circle}=\pi r^2$

We know that r is 5, so we can find our answer with the following:

$A_{circle}=\pi (5mi)^2=25 \pi mi^2$

Report an Error

Example Question #12 : Radius

While mailing some very important letters, you decide to use your circular rubber stamp. If the stamp has a radius of 3.5 cm, what is the area of the stamping surface?

Possible Answers:

$36 \pi cm^2$

$9.25 \pi cm^2$

12.25 cm

$12.25 \pi cm^2$

Correct answer:

$12.25 \pi cm^2$

Explanation:

While mailing some very important letters, you decide to use your circular rubber stamp. If the stamp has a radius of 3.5 cm, what is the area of the stamping surface?

Find the area of a circle by using the following formula:

$A_{circle}=\pi r^2$

Our radius is 3.5 cm, so plug that in:

$A_{circle}=\pi (3.5cm)^2=12.25 \pi cm^2$

Report an Error

Example Question #13 : Radius

You have a circular window in your vacation room. It has a radius of 9 inches. What is the area of the window?

Possible Answers:

$18 \pi in^2$

$81 \pi in^2$

$36 \pi in^2$

$81 \pi in$

Correct answer:

$81 \pi in^2$

Explanation:

You have a circular window in your vacation room. It has a radius of 9 inches. What is the area of the window?

To find the area of a circle, use the following formula:

$A=\pi r^2$

Now, we know the radius, so we just need to plug it in and solve.

$A=\pi (9 in)^2=81 \pi in^2$

So, our answer:

$81 \pi in^2$

Report an Error

Example Question #21 : Radius

Find the area of a circle with a radius of 6in.

Possible Answers:

$42\pi \text{ in}^2$

$18\pi \text{ in}^2$

$36\pi \text{ in}^2$

$24\pi \text{ in}^2$

$12\pi \text{ in}^2$

Correct answer:

$36\pi \text{ in}^2$

Explanation:

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

$A = \pi \cdot r^2$

Now, we know the radius of the circle is 6in.

Knowing this, we can substitute into the formula. We get

$A = \pi \cdot (6\text{in})^2$

$A = \pi \cdot 36\text{in}^2$

$A = 36\pi \text{ in}^2$

Report an Error

Example Question #22 : Radius

Find the area of a circle with a diameter of 10in.

Possible Answers:

$25\pi \text{ in}^2$

$10\pi \text{ in}^2$

$75\pi \text{ in}^2$

$100\pi \text{ in}^2$

$50\pi \text{ in}^2$

Correct answer:

$25\pi \text{ in}^2$

Explanation:

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

$A = \pi \cdot r^2$

where r is the radius of the circle.

Now, we know the diameter of the circle is 10in. We also know the diameter is two times the radius. Therefore, the radius is 5in.

Knowing this, we can substitute into the formula. We get

$A = \pi \cdot (5\text{in})^2$

$A = \pi \cdot 25\text{in}^2$

$A = 25\pi \text{ in}^2$

Report an Error

Example Question #23 : Radius

Find the area of a circle with a diameter of 14cm.

Possible Answers:

$63\pi \text{ cm}^2$

$196\pi \text{ cm}^2$

$21\pi \text{ cm}^2$

$49\pi \text{ cm}^2$

$56\pi \text{ cm}^2$

Correct answer:

$49\pi \text{ cm}^2$

Explanation:

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

$A = \pi \cdot r^2$

where r is the radius of the circle.

Now, we know the diameter of the circle is 14cm. We also know the diameter is two times the radius. Therefore, the radius is 7cm.

Knowing this, we can substitute into the formula. We get

$A = \pi \cdot (7\text{cm})^2$

$A = \pi \cdot 49\text{cm}^2$

$A = 49\pi \text{ cm}^2$

Report an Error

Example Question #15 : How To Find The Area Of A Circle

You have a tomato plant growing in a pot. If the base of the pot has a radius of 6 inches, find the area of the footprint of the pot.

Possible Answers:

120 in ^2

$36 \pi in^2$

$12 \pi in^2$

36 in^2

Correct answer:

$36 \pi in^2$

Explanation:

You have a tomato plant growing in a pot. If the base of the pot has a radius of 6 inches, find the area of the footprint of the pot.

To solve this problem, first recall the formula for area of a circle.

$A=\pi r ^2$

Now, we know our r=6 inches, so we just need to plug in and simplify.

$A=\pi (6in) ^2=36 \pi in^2$

So, our answer is:

$36 \pi in^2$

Report an Error

Example Question #25 : Radius

Let $\pi = 3.14$ .

Find the area of a circle with a diameter of 14cm. If necessary, round to the nearest tenths.

Possible Answers:

$150.7\text{cm}^2$

$153.9\text{cm}^2$

$113.1\text{cm}^2$

$153.8\text{cm}^2$

$201.0\text{cm}^2$

Correct answer:

$153.9\text{cm}^2$

Explanation:

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

$A = \pi \cdot r^2$

where r is the radius of the circle.

Now, we know the diameter of the circle is 14cm. We also know that the diameter is two times the radius. Therefore, the radius is 7cm.

We also know $\pi = 3.14$ .

Knowing all of this, we can substitute into the formula. We get

$A = 3.14 \cdot (7\text{cm})^2$

$A = 3.14 \cdot 49\text{cm}^2$

$A = 153.86\text{cm}^2$

We were asked to round to the nearest tenth. So, we get

$A = 153.9\text{cm}^2$

Report an Error

Example Question #26 : Radius

Find the area of a circle with a radius of 16in.

Possible Answers:

$187\pi \text{ in}^2$

$256\pi \text{ in}^2$

$89\pi \text{ in}^2$

$32\pi \text{ in}^2$

$121\pi \text{ in}^2$

Correct answer:

$256\pi \text{ in}^2$

Explanation:

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

$A = \pi r^2$

where r is the radius of the circle.

Now, we know the radius is 16in. Knowing this, we can substitute into the formula. We get

$A = \pi \cdot (16\text{in})^2$

$A = \pi \cdot 256\text{in}^2$

$A = 256\pi \text{ in}^2$

Report an Error

View Tutors

Reza
Certified Tutor

University of Sherbrooke, Doctor of Philosophy, Mathematics. University of Manitoba, Master of Science, Mathematics.

View Tutors

Gabby
Certified Tutor

University of Oregon, Bachelor in Arts, Journalism. University of Oregon, Current Grad Student, Communication, General.

View Tutors

Ana
Certified Tutor

Grand Canyon University, Bachelors, Education. Grand Canyon University, Masters, Education.

All ISEE Upper Level Math Resources

6 Diagnostic Tests 244 Practice Tests Question of the Day Flashcards Learn by Concept

Popular Subjects

French Tutors in New York City, Math Tutors in Washington DC, Biology Tutors in Houston, Calculus Tutors in Dallas Fort Worth, Statistics Tutors in Washington DC, GMAT Tutors in Phoenix, French Tutors in Los Angeles, Chemistry Tutors in Atlanta, Math Tutors in Los Angeles, LSAT Tutors in Philadelphia

Popular Courses & Classes

SAT Courses & Classes in New York City, GMAT Courses & Classes in San Diego, ISEE Courses & Classes in Houston, MCAT Courses & Classes in Philadelphia, MCAT Courses & Classes in Atlanta, SSAT Courses & Classes in Denver, GRE Courses & Classes in San Diego, LSAT Courses & Classes in Chicago, Spanish Courses & Classes in Atlanta, Spanish Courses & Classes in Boston

Popular Test Prep

GRE Test Prep in San Diego, ISEE Test Prep in Houston, SAT Test Prep in Denver, GMAT Test Prep in Washington DC, LSAT Test Prep in Chicago, LSAT Test Prep in Houston, MCAT Test Prep in Philadelphia, MCAT Test Prep in Atlanta, ISEE Test Prep in Denver, ACT Test Prep in Miami

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

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

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

All ISEE Upper Level Math Resources

Example Questions

Example Question #11 : How To Find The Area Of A Circle

Example Question #11 : Radius

Example Question #12 : Radius

Example Question #13 : Radius

Example Question #21 : Radius

Example Question #22 : Radius

Example Question #23 : Radius

Example Question #15 : How To Find The Area Of A Circle

Example Question #25 : Radius

Example Question #26 : Radius

All ISEE Upper Level Math Resources

Report an issue with this question

DMCA Complaint

Contact Information

Address

Complaint Details

Email address:
Your name:
Feedback: