横向
1
Symbol representing unknown value
6
Space between two intersecting lines
7
Lines that never intersect
9
U-shaped curve of a quadratic function
纵向
2
Sum divided by count
3
Value that does not change
4
Parts per hundred
5
Line touching circle at one point
8
Single numeral from 0 to 9
10
Steepness of a line
11
Corner point of a polygon