Step 5 Objective
Identify parallel and perpendicular lines; know the sum of angles at a point, on a straight line and in a triangle and recognise vertically opposite angles.
- Examples of what pupils should
know and be able to do - Probing questions
- What if pupils find
this a barrier?
Probing questions
How do you go about identifying parallel lines?
Give me some examples of shapes that have pairs of parallel lines.
What do you understand by perpendicular lines? Can a triangle have sides that are a pair of perpendicular lines? Why?
Is it possible to draw a triangle with:
- one acute angle?
- two acute angles?
- one obtuse angle?
- two obtuse angles? Why?
Give an example of each triangle, suggesting the sizes of the three angles, if it is possible. If it is impossible, explain why.