横向
1
The number representing nothing
3
Value that does not change
4
U-shaped curve of a quadratic function
6
Steepness of a line
9
Math using letters for unknown values
10
Longest side of a right triangle
纵向
2
Line crossing from corner to corner
5
Amount of space an object occupies
6
Part of a line with two endpoints
7
Sum divided by count
8
Number less than zero