横向
1
Closed shape with straight sides
5
Rectangle with four equal sides
6
Total distance around a shape
8
Split into equal parts
11
Round shape with all points equidistant
纵向
2
Math using letters for unknown values
3
Longest side of a right triangle
4
Visual representation of data
7
Number less than zero
9
Result of multiplication
10
Symbol representing unknown value
12
Repeated addition