横向
1
Total distance around a shape
3
Space between two intersecting lines
5
System of ordered marks for measuring
7
Part of a line with two endpoints
纵向
1
Lines that never intersect
2
Split into equal parts
3
Part of a circle's circumference
4
Rectangular array of numbers
5
Rectangle with four equal sides
6
Number with digits after a point
8
Number divisible only by 1 and itself