横向
1
Exact correspondence on both sides
3
Single numeral from 0 to 9
4
Steepness of a line
5
U-shaped curve of a quadratic function
10
Symbol representing unknown value
12
Amount of space an object occupies
纵向
1
Rectangle with four equal sides
2
Space between two intersecting lines
6
Proven mathematical statement
7
Line touching circle at one point
8
Number greater than zero
9
Result of multiplication
11
Comparison of two quantities
13
Value that does not change