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Topic Videos

Loci and Regions Revision Videos

AQA, Edexcel, OCR

Last updated 22 Mar 2021

Lines or regions that fit a given rule are called Locus or Loci. There are some that you need to know that are the same as constructions that you probably already know how to do, but you might not immediately recognise them. Here's some videos that should help you understand the topic better.

Locus of points a fixed distance from a point

Bespoke Education bring us a video showing that the locus of points from a point makes a circle. They also show us how to construct a locus of points from a line.

Locus from a Point or a Line

Locus of points a fixed distance from a line

Lambeth Academy shows us how to draw the locus of points a fixed distance from a line

Drawing Loci Around a Line (Lambeth Academy)

Locus of points which are equidistant from two given lines

When you draw the line that is equidistant from two lines that meet at an angle, you bisect that angle. Here's a video of Corbett Maths bisecting an angle.

Angle Bisector (Corbett Maths)

Locus of points which are equidistant from two given points

When you are given two points and you need to find all the points equidistant from those points, first draw a line joining the two points. Then follow the instructions in this video to create a perpendicular bisector of that line. All points on that bisector are equidistant from the points at the end of the original line. Corbett Maths shows you how.

Perpendicular Bisectors (CorbettMaths)

Answering loci questions

Knowing how to construct the loci is one thing, answering typical exam questions is another. Here's some videos showing both the basic techniques and some exam style questions

Construction and Loci (Lambeth Academy)
Loci part 2 (Corbettmaths)
Loci part 3 (Corbettmaths)
GCSE Maths (9-1) Loci and Locus (Ukmathsteacher)

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