A locus is a line that is always the same distance from another line, or point.

A circle, for example, is a locus of its centre - and is commonly used to solve loci problems. (A compass is your best friend in solving loci problems!)

When something is the same distance from two or more other things (lines, points, objects), we say that it is equidistant from those things (i.e. Equal-Distant).

For example, in the following image, the red line is equidistant from the two black lines.

[picture missing]

You will be expected to be able to construct a range of standard loci, as well build loci for unfamiliar shapes, based on the rules you know.

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