1. Which has the greatest area? Zhenruwenying central primary school
YuLian Wu

2. too small No, I only have 20-metres fences. Perimeter： Area：
Uncle.Bai 9m

3. Activity 1
When the perimeter is 20-metres , can he make a larger garden?
Requirement：
（1）Three people work together and use 20 sticks to make a rectangle(including a special kind of rectangle) (1 sticks represents 1 metre)
（2）How many different kinds of rectangles can you make and then fill out the grid.（the length and width are whole numbers.）

4. Use 16-metres fence to help him make a garden：
Shape:
rectangle or square
Think:
How many different rectangles can you make? Which has the greatest area.
Uncle.Li
（the length and width are whole numbers）

5. Activity 2 16 （ ） （the length and width are whole numbers） Perimeter
Area
(m²） 16
（ ） 1 7 7 2 6 12 3 5 15 4 4 16

6. Activity 3 18 （ ） （the length and width are whole numbers） Perimeter
Area
(m²） 18
（ ）

7. Activity 3 18 （ ） （the length and width are whole numbers） Perimeter
Area
(m²） 18
（ ） 7 1 8 8 5 2 7 14 3 3 6 18 1 4 5 20

9. Guess 6m 11m 9m 1m 3m 6m greatest smallest
（the length and width are whole numbers）
Tom, Jim and Tim make a garden with the fence of the same perimeter. 6m
11m 9m 1m
smallest 3m
greatest 6m

10. 6m 6m NO, we only have 24 We can use more fences. metres fences. Too
Can you help them to make a garden? The area must be more than 36m² and the shape still must be a rectangle or square.
NO, we only have 24
metres fences.
We can use more fences.
Too
Small! 6m
Three Pigs
But the length and the width are equal, and the area is the greatest! ! 6m

12. So Amazing
（the length and width are whole numbers）
30m
15m

13. Conclusion

14. Which has the greatest area? Zhenruwenying central primary school
YuLian Wu