横向
1
Space between two intersecting lines
4
Mathematical rule or equation
5
Value that does not change
11
Exact correspondence on both sides
12
Mathematical statement of equality
纵向
2
The number representing nothing
3
Distance from center to edge of circle
6
Number divisible only by 1 and itself
7
Closed shape with straight sides
8
Sum divided by count
9
Lines that never intersect
10
Longest side of a right triangle