Here is some of the basic definitions in maths.
Straight line-The shortest distance between two points. Parallel line - Two lines drawn in the same plane which never intersect each other.
Diameter -A straight line segment joining the center of a circle and a point on a circle.
Arc -An arc is a portion of the circumference of a circle.
Chord -A chord is a straight line joining two points on a circle.
Sector - A sector is that part of a circle which is bound by two radii and arc.
Segment - It is a part of a circle which is bound by a chord and am arc of a circle.
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