横向
1
Part of a circle's circumference
3
Number greater than zero
4
Single numeral from 0 to 9
5
Repeated addition
7
Amount of space an object occupies
8
Symbol representing unknown value
纵向
2
Line touching circle at one point
3
U-shaped curve of a quadratic function
6
Round shape with all points equidistant
9
Three-sided polygon