横向
1
Single numeral from 0 to 9
2
Result of addition
3
Number that divides evenly into another
5
Middle value in an ordered dataset
7
Exact correspondence on both sides
8
Total distance around a shape
9
Result of multiplication
纵向
2
Part of a line with two endpoints
4
Line segment connecting two circle points
6
Line touching circle at one point
8
U-shaped curve of a quadratic function