横向
1
Symbol representing unknown value
5
Mathematical rule or equation
6
The number representing nothing
7
Space between two intersecting lines
8
Total distance around a shape
12
U-shaped curve of a quadratic function
纵向
2
Steepness of a line
3
Lines that never intersect
4
Mathematical statement of equality
9
Number greater than zero
10
Number less than zero
11
Visual representation of data