横向
1
Comparison of two quantities
4
Exact correspondence on both sides
5
Power to which a number is raised
10
U-shaped curve of a quadratic function
11
Part of a circle's circumference
12
Middle value in an ordered dataset
13
Difference between highest and lowest values
纵向
2
Mathematical statement of equality
3
Round shape with all points equidistant
6
Longest side of a right triangle
7
Line crossing from corner to corner
8
Symbol representing unknown value
9
Part of a line with two endpoints