横向
1
Comparison of two quantities
4
Symbol representing unknown value
5
U-shaped curve of a quadratic function
11
Part of a line with two endpoints
13
Rectangular array of numbers
纵向
2
Steepness of a line
3
The number representing nothing
6
Line touching circle at one point
7
Round shape with all points equidistant
8
Result of raising a number to an exponent
9
Divisible by two
10
Reference line in a graph
12
Middle value in an ordered dataset