Connect arrays with area, find missing sides and compare rectangular designs.
Example 1
A rectangle has area 16 square metres and width 4m. What is its length in metres?
Show worked answer
Answer: 4
- Area = length × width.
- Divide the area by the width: 416=4m.
Example 2
A rectangle has area 60 square metres and width 5m. What is its length in metres?
Show worked answer
Answer: 12
- Area = length × width.
- Divide the area by the width: 560=12m.
Example 3
A rectangular garden is 10m long and 8m wide. What is its area in square metres?
Rectangular gardenDiagram not to scaleShow worked answer
Answer: 80
- Each row contains 10 one-square-metre units, with 8 rows.
- Area = length × width =10×8=80 square metres.