We are open Saturday and Sunday!

Call Now to Set Up Tutoring:

(888) 888-0446

High School Math : Radius

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 #2 : How To Find The Length Of A Radius

The specifications of an official NBA basketball are that it must be 29.5 inches in circumference and weigh 22 ounces. What is the approximate radius of the basketball?

Possible Answers:

9.39 inches

4.70 inches

3.06 inches

5.43 inches

14.75 inches

Correct answer:

4.70 inches

Explanation:

To Find your answer, we would use the formula: C=2πr. We are given that C = 29.5. Thus we can plug in to get [29.5]=2πr and then multiply 2π to get 29.5=(6.28)r. Lastly, we divide both sides by 6.28 to get 4.70=r. (The information given of 22 ounces is useless)

Report an Error

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

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

Possible Answers:

$9\pi$

Correct answer:

Explanation:

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

Plug in our given information.

$C=2\pi r$

$36\pi=2\pi r$

Divide both sides by $2\pi$ .

$\frac{36\pi}{2\pi}=\frac{2\pi}{2\pi} r$

18=r

Report an Error

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

Find the radius of a circle with area $169\pi$ .

Possible Answers:

169

13.5

Correct answer:

Explanation:

Since the formula for the area of a triangle is

$A=\pi r^2$

plug in the given area and isolate for . This yields 13.

Report an Error

Example Question #61 : Radius

The circumference of a circle is 45 inches. The circle's radius is ____ inches.

Possible Answers:

14.33

7.16

22.5

3.14

Correct answer:

7.16

Explanation:

When you know the circumference of a circle, you can determine its diameter by dividing the circumference by $\pi$ . Then, when you have the diameter, you can determine the radius by dividing the diameter by 2.

Report an Error

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

A circle with center (8, –5) is tangent to the y-axis in the standard (x,y) coordinate plane. What is the radius of this circle?

Possible Answers:

Correct answer:

Explanation:

For the circle to be tangent to the y-axis, it must have its outer edge on the axis. The center is 8 units from the edge.

Report an Error

Example Question #62 : Radius

A circle has an area of $49\pi \ in^{2}$ . What is the radius of the circle, in inches?

Possible Answers:

49 inches

14 inches

7 inches

16 inches

24.5 inches

Correct answer:

7 inches

Explanation:

We know that the formula for the area of a circle is πr². Therefore, we must set 49π equal to this formula to solve for the radius of the circle.

49π = πr²

49 = r²

7 = r

Report an Error

Example Question #1 : How To Find Circumference

A circle has radius 4.2 . What is the circumference, rounded to the nearest tenth?

$(\pi=3.14)$

Possible Answers:

26.4

17.6

55.4

13.2

Correct answer:

26.4

Explanation:

Circumference is given by the equation $C=2\pi r$ . We can use this equation with the given radius, 4.2, to solve for the circumference.

$C=2\pi r =2(3.14)(4.2)=26.4$

Report an Error

Example Question #1 : How To Find Circumference

What is the circumference of a circle with a radius of 12?

Possible Answers:

$13\pi$

$12\pi$

$144\pi$

$24\pi$

Correct answer:

$24\pi$

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 $Cicumference=2r\pi$

We then plug in the number for the radius into the equation yielding $Cicumference=2(12)\pi$

We multiply to find the value for the circumference is $24\pi$ .

The answer is $24\pi$ .

Report an Error

Example Question #2 : How To Find Circumference

A circle with an area of 13π in² is centered at point C. What is the circumference of this circle?

Possible Answers:

√13π

26π

13π

√26π

2√13π

Correct answer:

2√13π

Explanation:

The formula for the area of a circle is A = πr².

We are given the area, and by substitution we know that 13π = πr².

We divide out the π and are left with 13 = r².

We take the square root of r to find that r = √13.

We find the circumference of the circle with the formula C = 2πr.

We then plug in our values to find C = 2√13π.

Report an Error

Example Question #63 : Radius

A 6 by 8 rectangle is inscribed in a circle. What is the circumference of the circle?

Possible Answers:

6π

25π

8π

12π

10π

Correct answer:

10π

Explanation:

First you must draw the diagram. The diagonal of the rectangle is also the diameter of the circle. The diagonal is the hypotenuse of a multiple of 2 of a 3,4,5 triangle, and therefore is 10.
Circumference = π * diameter = 10π.

Report an Error

View Tutors

Dalton
Certified Tutor

University of Massachusetts Amherst, Doctor of Philosophy, Mathematics.

View Tutors

Samantha
Certified Tutor

University of Colorado Boulder, Bachelor of Science, Molecular Biochemistry.

View Tutors

Manikya
Certified Tutor

Osmania University, Bachelor of Science, Biology Teacher Education. Osmania University, Master of Science, Biology, General.

All High School Math Resources

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

Popular Subjects

ACT Tutors in San Francisco-Bay Area, Chemistry Tutors in New York City, Chemistry Tutors in Philadelphia, GRE Tutors in Los Angeles, GMAT Tutors in Houston, Math Tutors in Boston, Algebra Tutors in Philadelphia, ACT Tutors in San Diego, Math Tutors in Denver, English Tutors in Los Angeles

Popular Courses & Classes

LSAT Courses & Classes in Los Angeles, Spanish Courses & Classes in Denver, SSAT Courses & Classes in Chicago, ACT Courses & Classes in San Francisco-Bay Area, LSAT Courses & Classes in Seattle, GRE Courses & Classes in Boston, Spanish Courses & Classes in Los Angeles, SAT Courses & Classes in Los Angeles, MCAT Courses & Classes in Dallas Fort Worth, ISEE Courses & Classes in Dallas Fort Worth

Popular Test Prep

GMAT Test Prep in Miami, GRE Test Prep in San Francisco-Bay Area, MCAT Test Prep in New York City, GMAT Test Prep in San Diego, SSAT Test Prep in Houston, MCAT Test Prep in Seattle, SAT Test Prep in Boston, SAT Test Prep in Atlanta, ACT Test Prep in San Francisco-Bay Area, ISEE Test Prep in Houston

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 : Radius

Study concepts, example questions & explanations for High School Math

All High School Math Resources

Example Questions

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

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

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

Example Question #61 : Radius

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

Example Question #62 : Radius

Example Question #1 : How To Find Circumference

Example Question #1 : How To Find Circumference

Example Question #2 : How To Find Circumference

Example Question #63 : Radius

All High School Math Resources

Report an issue with this question

DMCA Complaint

Contact Information

Address

Complaint Details

Email address:
Your name:
Feedback: