横向
1
Longest side of a right triangle
5
The number representing nothing
9
Corner point of a polygon
10
Number less than zero
11
Distance from center to edge of circle
纵向
2
Steepness of a line
3
Number greater than zero
4
Collection of distinct elements
6
Visual representation of data
7
Mathematical statement of equality
8
Value that does not change
12
Number divisible only by 1 and itself