横向
1
Parts per hundred
4
U-shaped curve of a quadratic function
6
Divisible by two
7
Result of addition
纵向
1
Lines that never intersect
2
Amount of space an object occupies
3
Steepness of a line
4
Total distance around a shape
5
Round shape with all points equidistant
8
Number greater than zero
9
Part of a circle's circumference