横向
1
Line touching circle at one point
4
Corner point of a polygon
5
Lines that never intersect
6
Middle value in an ordered dataset
7
Math using letters for unknown values
8
Divisible by two
9
Rectangle with four equal sides
纵向
2
Value that does not change
3
Line crossing from corner to corner
4
Symbol representing unknown value
5
Number greater than zero
10
U-shaped curve of a quadratic function