横向
1
Middle value in an ordered dataset
5
System of ordered marks for measuring
7
Closed shape with straight sides
9
Collection of distinct elements
10
The number representing nothing
11
Value that does not change
13
Difference between highest and lowest values
纵向
2
Longest side of a right triangle
3
Divisible by two
4
Round shape with all points equidistant
6
Lines that never intersect
8
Number greater than zero
12
Repeated addition