横向
1
Math using letters for unknown values
6
Symbol representing unknown value
8
Number greater than zero
9
Corner point of a polygon
纵向
1
Space between two intersecting lines
2
Part of a circle's circumference
3
Visual representation of data
4
Lines that never intersect
5
Sum divided by count
7
Repeated addition
10
Middle value in an ordered dataset
11
Proven mathematical statement
12
Number less than zero
13
Single numeral from 0 to 9