1. Bisectors & Loci – Demonstration
This resource provides animated demonstrations of the mathematical method.
Check animations and delete slides not needed for your class.

2. Perpendicular Bisector
Cut in half.
90°

3. Perpendicular from a Point

4. Perpendicular from a Point to a Line

5. Angle Bisector

6. 60° Angle

7. What is the locus of a point that is always 4 cm away from B?

8. What is the locus of a point that is always the same distance from A & B?
This line is a perpendicular bisector of the line AB.

9. × A B What is the locus of a point that is always 3 cm from line AB?
What about here? × A B

10. Answers 1) Construct the locus of a point
that is equidistant between A and B.
2) Construct a perpendicular line from the point C. B A C
3) Mark the point X that lies within the triangle, is equidistant
from the lines DE and DF, and is 5 cm from F.
4) Construct a right-angled triangle using GH. Construct a 60° angle at H.
Find the ‘triangle centre’: the point equidistant from all sides. H E G
Answers D F

11. Answers 1) Construct the locus of a point
that is equidistant between A and B.
2) Construct a perpendicular line from the point C. B A C
3) Mark the point X that lies within the triangle, is equidistant
from the lines DE and DF, and is 5 cm from F.
4) Construct a right-angled triangle using GH. Construct a 60° angle at H.
Find the ‘triangle centre’: the point equidistant from all sides. H E G X
Answers D F

12. tom@goteachmaths.co.uk Questions? Comments? Suggestions?
…or have you found a mistake!?
Any feedback would be appreciated .
Please feel free to