横向
1
Line touching circle at one point
3
U-shaped curve of a quadratic function
5
Divisible by two
7
Steepness of a line
9
Reference line in a graph
纵向
2
Value that does not change
4
Rectangle with four equal sides
6
Number with digits after a point
7
Part of a line with two endpoints
8
The number representing nothing
10
Space between two intersecting lines