横向
1
Steepness of a line
4
Number greater than zero
5
Sum divided by count
6
Corner point of a polygon
9
Exact correspondence on both sides
10
Three-sided polygon
纵向
2
Amount of space an object occupies
3
Line touching circle at one point
5
Space between two intersecting lines
7
Part of a circle's circumference
8
The number representing nothing