Geometrical Construction
Using ruler and compasses
Remember the following when making geometrical constructions.
1. Use a hard pencil with a sharp point. This gives thin lines which are more accurate.
2. Check that your ruler has good straight edge. A damaged ruler is useless for construction work.
3. Check that your compasses are not too loose. Tighten loose compasses with a small screw driver.
4. All construction lines must be seen. Do not rub out anything which leads to the final result.
5. Always take great care, especially when drawing a line through a point.
6. Where possible, arrange that the angles of intersection between lines and arcs are about 900.
Perpendicular Bisector of a Line Segment
The locus of a point which moves so that it is an equal distance from two points, A and B, is the perpendicular bisector of the line joining A and B.
Perpendicular means at right angles to…
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