Loci are a set of points with the same property. Loci can be used to accurately construct lines and shapes. Bearings are three figure angles measured clockwise from North.

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A plane flies at equal distance between two control towers.

The locus of the plane is the perpendicular bisector of the two towers. When a line is divided into two equal lengths, it has been bisected.

Problems can involve intersecting loci. It may be necessary to use several constructions to locate a region.