横向
1
Exact correspondence on both sides
4
Closed shape with straight sides
6
Amount of space an object occupies
9
Line segment connecting two circle points
纵向
2
Math using letters for unknown values
3
Distance from center to edge of circle
4
U-shaped curve of a quadratic function
5
Total distance around a shape
7
Round shape with all points equidistant
8
Result of multiplication