横向
1
Divisible by two
4
Longest side of a right triangle
5
Middle value in an ordered dataset
6
Mathematical statement of equality
8
Total distance around a shape
11
Symbol representing unknown value
12
Sum divided by count
纵向
2
Part of a line with two endpoints
3
Round shape with all points equidistant
7
Corner point of a polygon
9
Math using letters for unknown values
10
Number divisible only by 1 and itself