definition: a circle is the set of all points on a plane that is a fixed distance from the center

Circle

By Juanita Bernal

Circle

Definition:

A circle is the set of all points on a plane that is a fixed distance from the center.

Definitions

Circumference of a circle is the length around it, also known as the perimeter.

Diameter of a circle is the length of the line through the center and touching two points on its edge.

DefinitionsRadius of a circle is the length of the line from the center to any point on its edge.

Area of a circle is the number of square units inside of it.

CircumferenceThe circumference of a circle can be calculated from its diameter using the formula :

Circumference = pie x diameter ( pie = 3.14 )

Circumference

Example : 18.84 = 3.14 x 6 3.14 6 is the diameter x 6 3.14 is pie 18.84

Diameter

The diameter of a circle can be calculated using the following formula:

Diameter = 2 x radius (r)

Diameter

Example : 20 = 2x 10 (r) 20 is the diameter 10 is the radius (½ diameter)

10 x 2 20

Radius

The radius of a circle can be calculated using the following formula:

Radius = diameter / 2

Radius

Example: 5 = 10 / 2 10 is the diameter ( radius ) 5 is half 10 (diameter)

Area

The area of a circle can be calculated by using the following formula:

Area =

Example: 113.04 = 3.14 x

r = 6

THE END