横向
1
Sum divided by count
5
Line touching circle at one point
8
The number representing nothing
9
Comparison of two quantities
10
Single numeral from 0 to 9
11
Symbol representing unknown value
12
Reference line in a graph
纵向
2
Line crossing from corner to corner
3
Math using letters for unknown values
4
Divisible by two
5
Three-sided polygon
6
Part of a line with two endpoints
7
Value that does not change