横向
1
Single numeral from 0 to 9
2
U-shaped curve of a quadratic function
3
System of ordered marks for measuring
4
Line segment connecting two circle points
7
Sum divided by count
8
Three-sided polygon
13
Rectangular array of numbers
纵向
2
Total distance around a shape
5
Distance from center to edge of circle
6
Lines that never intersect
9
Value that does not change
10
Proven mathematical statement
11
Closed shape with straight sides
12
Longest side of a right triangle