横向
1
Repeated addition
3
Collection of distinct elements
4
Middle value in an ordered dataset
7
Single numeral from 0 to 9
8
Distance from center to edge of circle
9
Sum divided by count
11
Closed shape with straight sides
12
Space between two intersecting lines
纵向
2
Lines that never intersect
5
U-shaped curve of a quadratic function
6
Line touching circle at one point
10
Visual representation of data