PARTS OF A CIRCLE

The outside of the circle is called

circumference

The circumference is the distance around the circle.

The midpoint of a circle is

centre

The line drawn from the centre to the circumference is …

radius

The line drawn from one circumference through the centre to another

circumference is …

radius

diameter

The diameter cuts the circle in half!

A line that connects one point on the edge of the circle with another point on the circle is called ….

chord

The chord that passes through thecentre of the circle is the diameter.

A segment ie. part of the circumference of the circle is called an ...

a rc

Parts of the Circle

centre

radius

diameter

chord

arc

Formulas

• D= 2*r • example if the radius is 3 2*3=6 so the

diameter is 6

• R= d/2 (half the diameter)• Example if the diameter is 10 then 10/2 = 5• So the radius is 5