横向
1
Single numeral from 0 to 9
3
Number divisible only by 1 and itself
4
Round shape with all points equidistant
5
The number representing nothing
6
Corner point of a polygon
7
Value that does not change
8
Distance from center to edge of circle
10
Result of addition
纵向
2
Exact correspondence on both sides
3
Number greater than zero
6
Amount of space an object occupies
9
Lines that never intersect
11
Total distance around a shape
12
Number with digits after a point
13
Steepness of a line