横向
1
Part of a whole number
2
Reference line in a graph
5
Visual representation of data
6
Lines that never intersect
8
Result of multiplication
9
Collection of distinct elements
10
Difference between highest and lowest values
纵向
2
Math using letters for unknown values
3
The number representing nothing
4
Line touching circle at one point
7
Distance from center to edge of circle
11
Round shape with all points equidistant
12
Number greater than zero
13
Three-sided polygon