横向
1
Closed shape with straight sides
4
Math using letters for unknown values
5
Proven mathematical statement
7
Result of addition
8
Longest side of a right triangle
11
Corner point of a polygon
12
Part of a circle's circumference
13
Line crossing from corner to corner
纵向
2
The number representing nothing
3
Part of a line with two endpoints
6
Mathematical statement of equality
9
Rectangular array of numbers
10
Three-sided polygon
14
Result of multiplication
15
Divisible by two