横向
1
Lines that never intersect
5
Rectangle with four equal sides
7
Reference line in a graph
8
Repeated addition
9
Line segment connecting two circle points
10
The number representing nothing
11
Math using letters for unknown values
纵向
2
Mathematical statement of equality
3
Split into equal parts
4
Line touching circle at one point
5
Part of a line with two endpoints
6
U-shaped curve of a quadratic function