# 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.

## Slide deck

## 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.

### 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.

### 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.

### 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).

## Video

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## Worksheet

## 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.