横向
1
Longest side of a right triangle
6
Split into equal parts
7
Difference between highest and lowest values
8
Sum divided by count
9
Number with digits after a point
11
Space between two intersecting lines
14
Number greater than zero
纵向
2
Number divisible only by 1 and itself
3
Rectangle with four equal sides
4
Middle value in an ordered dataset
5
Exact correspondence on both sides
10
Distance from center to edge of circle
12
The number representing nothing
13
Line touching circle at one point
15
Mathematical rule or equation