横向
1
Symbol representing unknown value
5
Mathematical statement of equality
6
Number divisible only by 1 and itself
7
Repeated addition
9
Longest side of a right triangle
12
Lines that never intersect
纵向
2
Single numeral from 0 to 9
3
Part of a line with two endpoints
4
Distance from center to edge of circle
6
U-shaped curve of a quadratic function
8
Amount of space an object occupies
10
Comparison of two quantities
11
Mathematical rule or equation