Circle Calculator

Enter the radius: Select unit: Area: Circumference:

The Circle Calculator is a tool that allows you to calculate various properties of a circle given one known value. It is commonly used in mathematics, engineering, and other fields that require calculations involving circles.

Concepts

Circle

A circle is a two-dimensional geometric shape that consists of all points in a plane that are at a given distance from a given point, the center. The distance between any point of the circle and the center is called the radius.

Formulae

The Circle Calculator uses the following standard formulas for a circle:

Area

The area of a circle is given by the formula:

/10

Education Quiz

Test your knowledge about topics related to education

1 / 10

What is the most common type of post-secondary education in the United States?

Vocational schools

Community colleges

Four-year universities

Trade schools

2 / 10

Who is the author of the famous novel "Pride and Prejudice"?

Jane Austen

Charlotte Bronte

Louisa May Alcott

Mary Shelley

3 / 10

We've all heard of a pandemic, but what is an 'infodemic'?

a compulsive need to continually search for information online

an excessive amount of information about a problem which may be misleading or confusing

an academic specializing in the analysis of infographics

4 / 10

What is the main purpose of a liberal arts education?

To prepare students for specific careers

To provide a broad-based education that cultivates critical thinking and problem-solving skills

To train students in a specific field

To develop students' technical skills

5 / 10

In which year was the first college in the United States founded?

1636

1693

1701

1746

6 / 10

Which of the following books is written by William Golding?

To Kill a Mockingbird

Animal Farm

Lord of the Flies

The Great Gatsby

7 / 10

What is the main difference between a public and a private university?

Location

Funding

Size

Degree programs offered

8 / 10

Who wrote the famous novel “Dracula”?

Stephen King

Bram Stoker

Mary Shelley

Edgar Allan Poe

9 / 10

What is the capital of the country France?

Paris

Marseille

Lyon

Toulouse

10 / 10

What is the main purpose of a thesis statement in an essay?

To summarize the essay

To provide background information

To state the main argument of the essay

To provide supporting evidence

Your score is

A = πr^2

where r is the radius of the circle.

Circumference

The circumference of a circle is given by the formula:

C = 2πr

where r is the radius of the circle.

Diameter

The diameter of a circle is twice the radius. Therefore, it is given by the formula:

D = 2r

Benefits

The Circle Calculator has several benefits:

Accuracy: The calculator applies correct formulas for each calculation.
Versatility: The calculator outputs area, circumference, and diameter from a single input.
Consistency: The calculator standardizes calculations between problems.
Accessibility: The calculator removes mental math barriers to multi-property calculation.
Applications: The calculator supports dimensions across scales for design, construction, etc.

Interesting Facts

A circle is one of the most basic geometric shapes and can be found in many everyday objects such as wheels, plates, and coins.
The area of a circle was first calculated by Archimedes in ancient Greece.
The formula for calculating the area of a circle was first written down by Euclid in his book “Elements”.
The circumference of a circle can be used to calculate its perimeter in geometry.

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Emma Smith

Emma Smith holds an MA degree in English from Irvine Valley College. She has been a Journalist since 2002, writing articles on the English language, Sports, and Law. Read more about me on her bio page.