LO:To find area of composite shapes.
Know:
- the dimensions of 2-D shapes such as length and width (height).
- the properties of 2-D shapes
Understand:
- That formulas can be used to quickly find the area of composite shapes.
- That composite shapes can be broken down to simple 2-D shapes.
Do:
- I can find the area of composite shapes..
Area of Composite Shapes
Composite shapes are shapes that have a combination of 2-D shapes. To find the area of composite shapes you just need to break down the shape into individual pieces and calculate their separate pieces then add them back together again to find a total area.
Finding the Area of Composite Shapes (alternative methods)
Another way of finding the area of composite shapes is to use a subtraction model.
I could break the shape to the right into 2 pieces and find the area of the square then the area of the rectangle.
Alternatively, I can find the area of the entire shape (16 x 12) then subtract the missing piece (in pink) from the larger piece.
Teaching Ideas
