横向
1
Rectangle with four equal sides
4
Reference line in a graph
5
Number less than zero
6
U-shaped curve of a quadratic function
7
System of ordered marks for measuring
8
Longest side of a right triangle
纵向
1
Exact correspondence on both sides
2
Mathematical rule or equation
3
Space between two intersecting lines
7
Collection of distinct elements
9
Corner point of a polygon