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The definition of congruent. Congruent lines, angles shapes.

Points of concurrency - the point where three or more lines intersect

Definition and properties of concentric circles

Definition of 'Perpendicular Bisector'

Definition of 'Line Bisector' and a general discussion of bisection. Link to 'angle bisector'

Definition of 'base' and the various different ways the word is used in geometry

Adjacent sides definition: Two lines that meet at a polygon vertex.

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