横向
1
Part of a whole number
3
Rectangle with four equal sides
6
The number representing nothing
8
Number divisible only by 1 and itself
9
Line segment connecting two circle points
10
Mathematical rule or equation
12
Proven mathematical statement
纵向
2
Math using letters for unknown values
4
Three-sided polygon
5
Steepness of a line
7
Amount of space an object occupies
11
Visual representation of data
13
Number with digits after a point