横向
1
Number with digits after a point
3
The number representing nothing
5
Lines that never intersect
7
Number divisible only by 1 and itself
8
Steepness of a line
10
Result of addition
纵向
2
Round shape with all points equidistant
4
Line touching circle at one point
5
Result of raising a number to an exponent
6
U-shaped curve of a quadratic function
9
Repeated addition