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circumference
the length round the outside of the circle (perimeter of a circle)
Arc
Part of the circumference of a circle
Radius
The distance from the center of a circle to any point on the circle
diameter
the distance across a circle through its center
Chord
a straight line that joins two points on the circumference
Tangent
a straight line that touches the circumference at only one point
segment
a portion of a circle that is enclosed by a chord and an arc
sector
a portion of a circle enclosed by two radii and an arc
semicircle
half of a circle
Note 
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