Locus/Loci - A set of points that share the same property , Angle Bisector - The process of splitting an angle in two, Pythagoras' Theorem - The rule for calculating lengths in a right angled triangle, Perpendicular Bisector - Intersecting at 90 degrees and splitting into two equal parts, Pi ( ∏ ) - How many times the circumference is bigger than the diameter, Squared - A number multiplied by itself, Radius - The distance half across a circle, Vertically opposite - Angles opposite each other at a point, Corresponding Angles - Two angles that form an F-shape, Alternate Angles - Two angles that form a Z-shape, Co-interior angles - Two angles within parallel lines that sum to 180 degrees, Circumference - The distance around the outside of a circle, Arc - Part of the circumference, Segment - The area sectioned when a line is drawn across a circle, Chord - A line that joins 2 points on a circumference,

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