Identifying Parts of a Circle
Maths: KS3, topic 4.6.1
Identifying Parts of a Circle
Learn how to identify the fundamental parts of a circle, including the radius, diameter, circumference, arc, and chord.
Radius and diameter
- The radius is a straight line from the centre to the edge of the circle.
- The diameter is a straight line passing through the centre, touching both edges.
- The diameter is always exactly times the length of the radius.
Circumference and arc
The circumference is the total distance around the outside edge of the circle.
An arc is just a section or part of the circumference.
Chords and segments
A chord is a straight line connecting any two points on the edge of the circle.
A segment is the area created between a chord and an arc.