Constructions and loci

What you'll learn

1. 1

   Imagine you're a pirate with a treasure map. 'Locus' just means the path a point follows when it obeys a rule.

2. 2

   Use the number line to show all the points that are exactly 3 steps from 0.

3. 3

   Let's find the locus of points that are 4 cm from point A.

4. 4

   Now you try: draw the locus of points that are 3 cm from point B.

5. 5

   What shape is the locus of points that are always the same distance from a fixed point?

6. 6

   What about points that are the same distance from two fixed points A and B?

7. 7

   The line that is the locus of points equidistant from two fixed points is called the...