横向
1
Corner point of a polygon
4
Rectangle with four equal sides
6
Closed shape with straight sides
7
U-shaped curve of a quadratic function
9
Symbol representing unknown value
10
Collection of distinct elements
纵向
2
Mathematical statement of equality
3
Split into equal parts
5
Number that divides evenly into another
8
Space between two intersecting lines
11
Reference line in a graph
12
Round shape with all points equidistant
13
Line touching circle at one point