横向
1
Distance from center to edge of circle
5
Line crossing from corner to corner
6
Sum divided by count
8
Result of multiplication
纵向
2
Symbol representing unknown value
3
Value that does not change
4
Number with digits after a point
7
Visual representation of data
9
Part of a line with two endpoints
10
Result of addition
11
Result of raising a number to an exponent
12
Exact correspondence on both sides
13
The number representing nothing