横向
1
Part of a line with two endpoints
2
U-shaped curve of a quadratic function
6
Line segment connecting two circle points
7
Line touching circle at one point
9
Math using letters for unknown values
纵向
2
Lines that never intersect
3
Number divisible only by 1 and itself
4
Single numeral from 0 to 9
5
Mathematical statement of equality
8
Number that divides evenly into another