A perpendicular bisector is a line that intersects a line segment (part of a line with a start and end point) at 90° and divides that line segment exactly in half. Every circle will have a radius that is the perpendicular bisector of a chord - i.e. for every chord in a circle, there is a radius that will be its perpendicular bisector.
In GCSE Mathematics, questions may require you to construct a perpendicular bisector accurately using pencil, ruler and compasses. Recognising situations that involve perpendicular bisectors can help solve problems without the need for accurately constructed diagrams.
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