Learn to measure a shape's boundary (perimeter) and the space it covers (area), using squares and simple formulas.
The perimeter is the total length of a shape's boundary — add up the length of every side to find it.
A rectangle has length 8 cm and width 5 cm. What is its perimeter?
2 × (8 + 5) = 26 cm
A square has each side 6 cm. What is its perimeter?
4 × 6 = 24 cm
The area tells you how much surface a shape covers, measured in square units. For a rectangle, area = length × width.
A rectangle has length 7 cm and width 4 cm. What is its area?
7 × 4 = 28 square cm
A square has each side 5 cm. What is its area?
5 × 5 = 25 square cm
1. A rectangle has length 10 cm and width 3 cm. What is its perimeter?
2. A square has each side 9 cm. What is its perimeter?
3. A rectangle has length 12 cm and width 6 cm. What is its area?
4. A square has each side 8 cm. What is its area?
5. A garden is 15 m long and 9 m wide. How much fencing is needed to go all the way around it?