横向
1
Number with digits after a point
4
Result of multiplication
5
The number representing nothing
8
Part of a line with two endpoints
9
Part of a circle's circumference
10
System of ordered marks for measuring
11
Mathematical statement of equality
纵向
2
Lines that never intersect
3
Proven mathematical statement
6
Value that does not change
7
Collection of distinct elements
12
Rectangular array of numbers
13
Math using letters for unknown values