横向
1
Repeated addition
3
Sum divided by count
4
Part of a circle's circumference
6
Mathematical statement of equality
9
Distance from center to edge of circle
11
The number representing nothing
12
Total distance around a shape
13
Amount of space an object occupies
15
Visual representation of data
纵向
2
Exact correspondence on both sides
5
Divisible by two
7
Three-sided polygon
8
Symbol representing unknown value
10
Number greater than zero
14
Result of multiplication