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A circle is a two dimensional (2D) shape.
It is defined as a set of points that are all the same distance away from a point called the centre.
Some people say that a circle is a polygon with an infinite amount of sides.
A semicircle is half of a circle.
The circumference of the circle is the distance around the outside of the circle.
The radius of the circle is a line segment that goes from the centre to a point on the circumference.
The plural of radius is radii.
This is more than one radius drawn inside a circle.
The diameter is a line segment that starts on the circumference and finishes on the circumference and passes through the centre.
The diameter is twice the radius.
A chord is a line segment that starts on the circumference and finishes on the circumference but does NOT pass through the centre.
An arc is part of the circumference.
A minor arc is an arc that is less than half of the circumference of the circle.
A major arc is an arc that is greater than half of the circumference of the circle.
A segment is a part/region of the circle that is between a chord and an arc.
A minor segment is a segment that is less than half the area of the circle.
A major segment is a segment that is greater than half the area of the circle.
A sector is a part/region of a circle between an arc and two radii.
A minor sector is a sector that is less than half the area of the circle.
A major segment is a segment that is greater than half the area of the circle.
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