Parts of a Circle

Circumference

The special name given to the perimeter of a circle

Centre

The middle point of a circle

Diameter

Any straight line joinging 2 points on the circumference that passes through the centre.

Radius (radii)

a straight line joining the centre to the circumference

Arc

a curved line joining 2 points on the circumference

Sector

an area between two radii and an arc

Chord

Any straight line joinging 2 points on the circumference that does not pass through the centre.

Segment

the area between a chord and an arc

Tangent

a straight line which touches the circle at one point only (the point of contact)

Multiple Choice

What part of the circle is labelled 50cm?

• Diameter

• Circumference

• Radius

• Arc

Multiple Choice

What is the name of the yellow section?

• Segment

• Sector

• Arc

• Area

Multiple Select

Select the name for:

1) the line A-B

3) point C

• Centre

• Circumference

• Arc

• Middle

• Radius