横向
1
Longest side of a right triangle
5
Symbol representing unknown value
7
Single numeral from 0 to 9
9
Mathematical statement of equality
10
Line segment connecting two circle points
11
Number that divides evenly into another
纵向
2
Number with digits after a point
3
U-shaped curve of a quadratic function
4
Reference line in a graph
6
Visual representation of data
8
The number representing nothing
12
Number divisible only by 1 and itself