横向
1
Total distance around a shape
2
Result of addition
6
Mathematical statement of equality
7
Proven mathematical statement
8
Single numeral from 0 to 9
11
Part of a circle's circumference
纵向
2
Exact correspondence on both sides
3
The number representing nothing
4
Reference line in a graph
5
Result of multiplication
9
System of ordered marks for measuring
10
Divisible by two
12
Round shape with all points equidistant
13
Value that does not change