Step 10 Objective
Solve problems using properties of angles, of parallel and intersecting lines, and of triangles and other polygons, justifying inferences and explaining reasoning with diagrams and text.
- Examples of what pupils should
know and be able to do - Probing questions
- What if pupils find
this a barrier?
Probing questions
For a given diagram:
Talk me through the information that has been given to you in this diagram. How do you decide where to start in order to find the missing angle(s) or to solve the geometrical problem?
What clues do you look for when finding a missing angle for a geometrical diagram?
What's the minimum information you would need in order to be able to find all the angles in this diagram?
What clues do you look for when solving a geometrical problem? How do you decide where to start? Is it possible to solve the problem in a different way?
How would you convince somebody that the exterior angles of a polygon add up to 360°?
Can you explain why the exterior angle of a triangle is equal to the sum of the two interior opposite angles?