横向
1
Rectangle with four equal sides
3
Total distance around a shape
4
Math using letters for unknown values
5
Lines that never intersect
12
Line touching circle at one point
纵向
2
Repeated addition
3
U-shaped curve of a quadratic function
6
Middle value in an ordered dataset
7
Space between two intersecting lines
8
System of ordered marks for measuring
9
Number divisible only by 1 and itself
10
Closed shape with straight sides
11
Longest side of a right triangle