TG parts of a circle
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what is the circumference of a circle
 the outline of the circle

what is an arc of a circle ?
any part of the circumference

what is the diameter of a circle
 a chord that passes through the centre of a circle. It is the size of the circle.

what is a semi circle ?
 a semi cirlce is half a circle

what is the quadrant of a circle ?
 a quater of a circle

What is a segment?
 A segment is a cut part of a circle where the cut line does not go through the centre point.

What is a radius?
 This is the line joining the centre to a point on the circumference. It is half of the diameter.

What is a sector?
 A section of a circle enclosed by two radii and an arc

What is a radius?
A line joining the centre to a point on the circumference. It is often abbreviated to R. The plural of radius is radii.

What is a secant?
 A line that intersects a circle at two points.

what is Concentric circles?
 They are circles that have the same centre but different radii. A dart board is a good example.

What is a Eccentric circle?
 They are circles that have different centres and different radii