横向
1
Distance from center to edge of circle
5
Symbol representing unknown value
6
Number with digits after a point
7
Mathematical rule or equation
9
Value that does not change
10
Sum divided by count
纵向
2
Three-sided polygon
3
Line segment connecting two circle points
4
Part of a line with two endpoints
8
Result of addition
11
Middle value in an ordered dataset
12
Result of multiplication
13
Result of raising a number to an exponent