Perpendicular bisector of a line.

1. A B Join up the points where your circles cross. Perpendicular bisector of a line. Draw the same size circle with centre B Draw a circle with centre A. Perpendicular Bisector

2. Perpendicular from a point to a line. Draw an arc with the point as the centre.

3. Perpendicular from a point to a line. Draw circles with centres on the two arcs. Perpendicular line

4. Perpendicular from a point on a line. Draw arcs from the point that cut the line.

5. Perpendicular from a point on a line. Draw circles with centres on the two arcs.

6. Angle Bisector. Draw arcs from the angle to cut the lines

7. Angle Bisector. Draw circles with centres on the two arcs.

8. Angle Bisector. Has the line bisected the angle?

9. From this point draw a circle (arc) of the same radius From the starting point draw a circle of any radius.

10. Join the intersection to your starting point. Measure your angle

11. 90 degree angle. From this point draw a circle (arc) of the same radius Start with the 600 angle (but don’t join it up)

12. 90 degree angle. Join up the intersections From these arcs draw two more intersecting circles You now have a right angle!