横向
1
Part of a line with two endpoints
4
Proven mathematical statement
7
Split into equal parts
8
Mathematical statement of equality
9
Exact correspondence on both sides
10
Middle value in an ordered dataset
12
Lines that never intersect
纵向
2
The number representing nothing
3
Number divisible only by 1 and itself
4
Line touching circle at one point
5
Amount of space an object occupies
6
Part of a circle's circumference
11
Reference line in a graph