横向
1
Result of multiplication
2
Repeated addition
3
Space between two intersecting lines
5
Sum divided by count
10
Three-sided polygon
11
Round shape with all points equidistant
12
Result of addition
纵向
2
Middle value in an ordered dataset
4
Symbol representing unknown value
6
Total distance around a shape
7
Longest side of a right triangle
8
Lines that never intersect
9
System of ordered marks for measuring
13
Single numeral from 0 to 9