横向
1
Math using letters for unknown values
4
Total distance around a shape
5
Line touching circle at one point
6
Steepness of a line
7
Mathematical statement of equality
8
Comparison of two quantities
10
Number greater than zero
纵向
2
Three-sided polygon
3
The number representing nothing
4
U-shaped curve of a quadratic function
9
Line crossing from corner to corner
11
Amount of space an object occupies