Step 7 Objective
Deduce and use formulae for the area of a triangle, a parallelogram and a trapezium; calculate areas of compound shapes made from rectangles and triangles.
- Examples of what pupils should
know and be able to do - Probing questions
- What if pupils find
this a barrier?
What if pupils find this a barrier?
For areas of triangles start with right-angled triangles and establish that the area is half the area of the surrounding rectangle. Extend to any triangle; focus on pupils identifying a base and perpendicular height. Give more information in diagrams than needed. Discuss strategies to identify the necessary information.
Similarly for compound shapes.