Examples of what pupils should know and be able to do
Probing questions
How could you convince me that the sum of the angles of a triangle is 180°?
Why are parallel lines important when proving the sum of the angles of a triangle?
How does knowing the sum of the angles of a triangle help you to find the sum of angles of a quadrilateral? Will this work for all quadrilaterals? Why?
What if pupils find this a barrier?
The Year 9 geometrical reasoning mini-pack has many innovative ideas to support pupils' understanding. Use the visualisation exercises to help pupils construct and mentally move images.
Use the build-ups to demonstrate geometrical proof.
Interacting with mathematics in Key Stage 3: Geometrical reasoning mini-pack
Year 10 Bridging Unit Project 4: Developing Geometrical Reasoning
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