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?
Probing questions
Why do you have to multiply the base by the perpendicular height to find the area of a parallelogram?
Right-angled triangles have half the area of the surrounding rectangle with the same base and height. What about non-right angled triangles?
The area of a triangle is 12 cm². What are the possible lengths of the base and height?
What other formulae for the area of two-dimensional shapes do you know?
Is there a formula for every two-dimensional shape?