横向
1
Corner point of a polygon
5
Three-sided polygon
6
Value that does not change
7
U-shaped curve of a quadratic function
8
Proven mathematical statement
9
Number less than zero
纵向
2
Part of a circle's circumference
3
Sum divided by count
4
Lines that never intersect
10
Amount of space an object occupies
11
Exact correspondence on both sides