横向
1
U-shaped curve of a quadratic function
2
Part of a line with two endpoints
7
Number with digits after a point
8
Lines that never intersect
9
Reference line in a graph
10
Repeated addition
11
Math using letters for unknown values
纵向
2
Exact correspondence on both sides
3
Visual representation of data
4
Round shape with all points equidistant
5
Number divisible only by 1 and itself
6
Steepness of a line