横向
1
Corner point of a polygon
4
Result of addition
6
The number representing nothing
7
Lines that never intersect
9
Number less than zero
纵向
2
Mathematical statement of equality
3
Number that divides evenly into another
5
Rectangular array of numbers
8
Reference line in a graph
10
Split into equal parts
11
Space between two intersecting lines
12
Number with digits after a point
13
Middle value in an ordered dataset