横向
1
Line crossing from corner to corner
4
Number that divides evenly into another
6
Reference line in a graph
7
Mathematical statement of equality
9
Symbol representing unknown value
纵向
2
Part of a circle's circumference
3
Number less than zero
5
Math using letters for unknown values
8
Steepness of a line
10
Comparison of two quantities
11
Longest side of a right triangle
12
Line segment connecting two circle points
13
Total distance around a shape