Calculate the area of compound rectilinear shapes
I can calculate the area of compound rectilinear shapes.
Calculate the area of compound rectilinear shapes
I can calculate the area of compound rectilinear shapes.
Lesson details
Key learning points
- Use addition and subtraction to calculate missing side lengths in compound rectilinear shapes.
- Identify two different lengths which total another side length in a compound rectilinear shape.
- Use knowledge of the area of a rectangle to calculate the area of shapes made from two rectangles.
Keywords
Compound - A shape made up of two or more other shapes is known as compound.
Rectilinear - A shape where all angles composed of right angles is called a rectilinear shape.
Common misconception
Calculating the length of a side when the overall dimension and part dimensions are known and understanding when a part of the overall dimension is needed to calculate part of the area.
Look at shapes with missing dimensions and discussing that the overall length and width of a compound rectilinear shape is the total of the shorter side lengths in a particular direction. This allows missing or overall dimensions to be calculated.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
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Starter quiz
6 Questions
is a rectilinear shape.
is a compound shape.
Exit quiz
6 Questions
has four right angles.
is made up of two or more shapes.
has angles that are all right angles.
is made up of two or more rectangles.
