# Area notes

## Summary

For a triangle, use the base and its perpendicular height.[^source]

## Data and formula

| Base (cm) | Height (cm) | Area (cm²) |
| --- | --- | --- |
| 6 | 4 | 12 |

$$
A = \frac{bh}{2} = \frac{6 \times 4}{2} = 12
$$

The area is expressed in square centimetres, not centimetres.[^unit]

[^source]: These numbers are self-authored teaching examples, not experimental measurements.
[^unit]: Area uses square units.