横向
1
Result of multiplication
2
Difference between highest and lowest values
3
Line crossing from corner to corner
6
U-shaped curve of a quadratic function
7
Amount of space an object occupies
8
Steepness of a line
纵向
1
Lines that never intersect
3
Number with digits after a point
4
The number representing nothing
5
Single numeral from 0 to 9
9
Corner point of a polygon