# Circles

**Topics covered**

Circle & Related Terms- Geometrical definition, Position of a point, Circular Region, Secant & Tangent,Radius,Circumference, Chord & Diameter, Concentric circles, Arc of a circle, Semicircle, Minor & major Arc, Segment of a circle, Sector & Quadrant of a circle, Congruent circles and arcs;Properties of Chords- Theorem 1, Theorem 2, Theorem 3, Theorem 4;Results on Equal Chords- Theorem 5, Theorem 6;Angles Subtended by Arcs-Theorem 7, Theorem 8;Cyclic Quadrilateral & its Properties- Cyclic Quadrilateral, Theorem 10, Theorem 11;

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