Perimeter and area
Perimeter is the distance around the outside. Area is the space inside, measured in squares.
Key facts
- Rectangle: area = length × width.
- Triangle: area = ½ × base × height.
- Perimeter: add up every side.
Worked examples
Example 1
A triangle has base 10 cm and height 6 cm. Find its area.
- Multiply base by height. 10 × 6 = 60
- Halve it. 60 ÷ 2 = 30 cm²
Answer: 30 cm²