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

← Previous 1 2 3 4 5 6 7 8 9 Next →

Example Question #1 : How To Find Circumference

A gardener wants to build a fence around their garden shown below. How many feet of fencing will they need, if the length of the rectangular side is 12 and the width is 8?

Screen_shot_2013-03-18_at_4.54.03_pm

Possible Answers:

96 ft

8π + 24

4π + 24

40 ft.

Correct answer:

8π + 24

Explanation:

The shape of the garden consists of a rectangle and two semi-circles. Since they are building a fence we need to find the perimeter. The perimeter of the length of the rectangle is 24. The perimeter or circumference of the circle can be found using the equation C=2π(r), where r= the radius of the circle. Since we have two semi-circles we can find the circumference of one whole circle with a radius of 4, which would be 8π.

Report an Error

Example Question #1 : How To Find Circumference

The diameter of a circle is defined by the two points (2,5) and (4,6). What is the circumference of this circle?

Possible Answers:

5π

π√2.5

None of the other answers

π√5

2.5π

Correct answer:

π√5

Explanation:

We first must calculate the distance between these two points. Recall that the distance formula is:√((x₂ - x₁)² + (y₂ - y₁)²)

For us, it is therefore: √((4 - 2)² + (6 - 5)²) = √((2)² + (1)²) = √(4 + 1) = √5

If d = √5, the circumference of our circle is πd, or π√5.

Report an Error

Example Question #1 : Circumference Of A Circle

If a circle has an area of $81\pi$ , what is the circumference of the circle?

Possible Answers:

$90\pi$

$27\pi$

$9\pi$

$81\pi$

$18\pi$

Correct answer:

$18\pi$

Explanation:

The formula for the area of a circle is πr². For this particular circle, the area is 81π, so 81π = πr². Divide both sides by π and we are left with r²=81. Take the square root of both sides to find r=9. The formula for the circumference of the circle is 2πr = 2π(9) = 18π. The correct answer is 18π.

Report an Error

Example Question #1 : How To Find Circumference

Circle_with_radius

Find the circumference of a circle with a radius of r=3.5cm .

Possible Answers:

$\dpi{100} 3.5 \pi cm$

$\dpi{100} 7 cm$

$7 \pi cm$

Not enough information to solve

$\dpi{100} 7 \pi^{2} cm$

Correct answer:

$7 \pi cm$

Explanation:

In order to find the circumference, we will use the formula $C=2\pi r$ .

$C=2\pi r$

$C=2*\pi*3.5cm$

$\rightarrow 7 \pi cm$

Report an Error

Example Question #121 : Geometry

This figure is a circle with a radius of 3 cm. Circle

What is the circumference of the circle (cm)?

Possible Answers:

$27\pi$

$6\pi$

$3\pi$

$9\pi$

$12\pi$

Correct answer:

$6\pi$

Explanation:

In order to find the circumference of a circle (which is the perimeter or distance around the circle), you must double the radius and multiply by pi ( $2\cdot3\cdot\pi=6\pi$ ).

Report an Error

Example Question #71 : Radius

What is the circumference of a circle with a radius of 4?

Possible Answers:

$14\Pi$

$4\Pi$

$16\Pi$

$8\Pi$

$24\Pi$

Correct answer:

$8\Pi$

Explanation:

The equation for the circumference of a circle is $2\Pi r$ , so by substituting the given radius into the equation, we get $8\Pi$ .

Report an Error

Example Question #71 : Radius

A circle has a diameter of 13 cm. What is the circle's circumference?

Possible Answers:

20.41

134.45

40.84

53.5

26.75

Correct answer:

40.84

Explanation:

To find the circumference of a circle, multiply the circle's diameter by $\pi$ .

Report an Error

Example Question #72 : Radius

Find the circumference of the following circle:

Possible Answers:

$16 \pi\ m$

$10 \pi\ m$

$8 \pi\ m$

$12 \pi\ m$

$14 \pi\ m$

Correct answer:

$14 \pi\ m$

Explanation:

The formula for the circumference of a circle is

$C = 2 \pi (r)$ ,

where is the radius of the circle.

Plugging in our values, we get:

$C = 2\pi (7\ m)$

$C = 14 \pi\ m$

Report an Error

Example Question #4 : How To Find Circumference

A car tire has a radius of 18 inches. When the tire has made 200 revolutions, how far has the car gone in feet?

Possible Answers:

3600π

500π

300π

600π

Correct answer:

600π

Explanation:

If the radius is 18 inches, the diameter is 3 feet. The circumference of the tire is therefore 3π by C=d(π). After 200 revolutions, the tire and car have gone 3π x 200 = 600π feet.

Report an Error

Example Question #1 : How To Find Circumference

A circle has the equation below. What is the circumference of the circle?

(x – 2)² + (y + 3)² = 9

Possible Answers:

$6\pi$

$3\pi$

$16\pi$

$9\pi$

Correct answer:

$6\pi$

Explanation:

The radius is 3. Yielding a circumference of $6\pi$ .

Report an Error

← Previous 1 2 3 4 5 6 7 8 9 Next →

View Tutors

Samarth
Certified Tutor

Maharaja Sayajirao University of Baroda, Bachelor of Engineering, Mechanical Engineering. Concordia University-Seward, Master...

View Tutors

Zahid
Certified Tutor

kurukshetra university haryana , Master's/Graduate, Civil engineering.

View Tutors

Lucille
Certified Tutor

University of Central Florida, Bachelor of Science, Education. University of Central Florida, Doctor of Education, Curriculum...

All High School Math Resources

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

Popular Subjects

Math Tutors in Los Angeles, MCAT Tutors in San Diego, Physics Tutors in Phoenix, Spanish Tutors in New York City, ISEE Tutors in Houston, Computer Science Tutors in Houston, Biology Tutors in Chicago, LSAT Tutors in Dallas Fort Worth, MCAT Tutors in New York City, Math Tutors in Phoenix

Popular Courses & Classes

ISEE Courses & Classes in Chicago, GRE Courses & Classes in Atlanta, SAT Courses & Classes in Houston, ISEE Courses & Classes in Seattle, MCAT Courses & Classes in San Diego, SAT Courses & Classes in Miami, SAT Courses & Classes in Dallas Fort Worth, ISEE Courses & Classes in Phoenix, MCAT Courses & Classes in Miami, GMAT Courses & Classes in Seattle

Popular Test Prep

GRE Test Prep in Los Angeles, GMAT Test Prep in Seattle, ACT Test Prep in San Diego, LSAT Test Prep in Denver, ISEE Test Prep in Washington DC, MCAT Test Prep in San Francisco-Bay Area, MCAT Test Prep in Dallas Fort Worth, ISEE Test Prep in Phoenix, ACT Test Prep in Washington DC, LSAT Test Prep in San Diego

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 #1 : How To Find Circumference

Example Question #1 : How To Find Circumference

Example Question #1 : Circumference Of A Circle

Example Question #1 : How To Find Circumference

Example Question #121 : Geometry

Example Question #71 : Radius

Example Question #71 : Radius

Example Question #72 : Radius

Example Question #4 : How To Find Circumference

Example Question #1 : How To Find Circumference

All High School Math Resources

Report an issue with this question

DMCA Complaint

Contact Information

Address

Complaint Details

Email address:
Your name:
Feedback: