横向
1
Repeated addition
5
Round shape with all points equidistant
6
Collection of distinct elements
7
U-shaped curve of a quadratic function
8
Space between two intersecting lines
9
Number that divides evenly into another
11
Value that does not change
纵向
2
Mathematical statement of equality
3
Lines that never intersect
4
Number less than zero
10
Reference line in a graph
12
Part of a whole number
13
Distance from center to edge of circle