横向
1
Longest side of a right triangle
5
U-shaped curve of a quadratic function
7
Lines that never intersect
9
Middle value in an ordered dataset
10
Distance from center to edge of circle
12
Line touching circle at one point
13
Line crossing from corner to corner
纵向
2
Number that divides evenly into another
3
Line segment connecting two circle points
4
Value that does not change
5
Total distance around a shape
6
Round shape with all points equidistant
8
Rectangle with four equal sides
9
Rectangular array of numbers
11
Exact correspondence on both sides