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Join The Student Room TodayBe part of the UK's largest and fastest growing student community. It's free to join and a lot of fun - Get inspired, express your ideas, interact and share Revision:LociFrom The Student RoomTSR Wiki > Study Help > Subjects and Revision > Revision Notes > Mathematics > Loci LociA locus is a set of points satisfying a certain condition. The term 'locus', however, is rarely used in exams. The question is more likely to be of this format:
ExampleThe diagram shows two points P and Q. On the diagram shade the region which contains all the points which satisfy both the following: the distance from P is less than 3cm, the distance from P is greater than the distance from Q.
If we draw a line in the middle of P and Q, all of the points on this line will be the same distance from P as they are from Q. They will be therefore closer to Q, and further away from P, if they are on the right of such a line. Therefore all of the points satisfying both of these conditions are shaded in red.
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