横向
1
Line crossing from corner to corner
3
Number divisible only by 1 and itself
7
Sum divided by count
8
Mathematical statement of equality
纵向
2
Symbol representing unknown value
4
The number representing nothing
5
Line segment connecting two circle points
6
U-shaped curve of a quadratic function
9
Reference line in a graph
10
Exact correspondence on both sides
11
Part of a line with two endpoints
12
Result of raising a number to an exponent