横向
1
Round shape with all points equidistant
3
Reference line in a graph
5
Visual representation of data
6
Corner point of a polygon
7
The number representing nothing
8
Line crossing from corner to corner
9
Repeated addition
12
Longest side of a right triangle
14
Sum divided by count
15
Proven mathematical statement
纵向
2
Mathematical statement of equality
4
Number less than zero
10
U-shaped curve of a quadratic function
11
Line touching circle at one point
13
Rectangular array of numbers