Step 7 Objective
Use a straight edge and compasses to construct:
- the midpoint and perpendicular bisector of a line segment;
- the bisector of an angle;
- the perpendicular from a point to a line;
- the perpendicular from a point on a line.
Construct a triangle, given three sides (SSS); use ICT to explore these constructions.
- Examples of what pupils should
know and be able to do - Probing questions
- What if pupils find
this a barrier?
Probing questions
Why are compasses important when doing constructions?
Why does understanding the properties of a rhombus help you to understand simple constructions such as the bisector of an angle?
For which constructions is it important to keep the same compass arc (distance between the pencil and the point of your compasses)?
Why?