Circle - a round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center)., Radius - Radius is defined as a line segment that connects the center of a circle or a sphere to its circumference or boundary., Chord - a circle is a straight line segment whose endpoints both lie on a circular arc., Secant - A straight line segment that passes through the center of the circle and has its endpoints on the circle's circumference, also known as the longest chord of the circle., Tangent - a line that touches a curve (like a circle) at exactly one point, without intersecting or passing through it., Point of Tangency - An unique point at which a given tangent line meets a geometric figure, such as a circle or plane curve., Central Angle - A central angle is an angle whose apex is the center O of a circle and whose legs are radii intersecting the circle in two distinct points A and B., Inscribed - In geometry, an inscribed angle is the angle formed in the interior of a circle when two chords intersect on the circle., Arc - A circular arc is the arc of a circle between a pair of distinct points., Minor Arc - an arc of a circle that measures less than 180 degrees, or less than half the circumference of the circle., Major Arc  - the longer arc connecting two points on a circle, having a measure greater than 180 degrees and is named using three letters (the two endpoints and a third point on the arc)., Semicircle - In mathematics, a semicircle is a one-dimensional locus of points that forms half of a circle. It is a circular arc that measures 180°. It only has one line of symmetry.,

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