横向
1
Value that does not change
4
Line crossing from corner to corner
5
The number representing nothing
6
Number less than zero
8
Mathematical statement of equality
9
Part of a circle's circumference
纵向
2
U-shaped curve of a quadratic function
3
Math using letters for unknown values
7
Amount of space an object occupies
10
Longest side of a right triangle
11
Corner point of a polygon
12
Part of a line with two endpoints