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Basic Concepts in Geometry
Parallel Line
Triangles
 Concept of Triangles  Sides, Angles, Vertices, Interior and Exterior of Triangle
 Theorem of remote interior angles of a triangle
 Congruence of Triangles
 Isoscles Triangle Theorem
 Property of 306090 Triangle Theorem
 Median of a Triangle
 Perpendicular bisector Theorem
 Angle bisector theorem
 Properties of inequalities of sides and angles of a triangle
 Similar Triangles
Constructions of Triangles
Quadrilaterals
Circle
Coordinate Geometry
Trigonometry
Surface area and volume
description
Properties of congruent chords:
 A perpendicular drawn from the centre of a circle on its chord bisects the chord.

The segment joining the centre of a circle and the midpoint of its chord is perpendicular to the chord.
Relation between congruent chords of a circle and their distances from the centre

Congruent chords of a circle are equidistant from the centre of the circle.

The chords of a circle equidistant from the centre of a circle are congruent.
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