from: category_eng

1.

length problem is closely related to area

2.

3.

4.

5.

???????? ?????????? ?????.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

16.

17.

18.

1.	Application
length problem is closely related to area

2.

3.

4.

5.	Word problem
???????? ?????????? ?????.

6.	Application

7.

8.

9.

10.

11.

12.

13.

14.

15.

16.

17.	Calculation

18.	Application