横向
1
Math using letters for unknown values
5
Line touching circle at one point
6
Middle value in an ordered dataset
7
Number less than zero
9
Line segment connecting two circle points
纵向
2
Proven mathematical statement
3
Three-sided polygon
4
Result of multiplication
8
Corner point of a polygon
10
The number representing nothing
11
Result of raising a number to an exponent
12
Comparison of two quantities