横向
1
The number representing nothing
3
Longest side of a right triangle
4
Lines that never intersect
8
Rectangular array of numbers
9
Part of a line with two endpoints
11
Amount of space an object occupies
13
Round shape with all points equidistant
纵向
2
Number that divides evenly into another
5
Repeated addition
6
Number with digits after a point
7
Steepness of a line
10
Three-sided polygon
12
Comparison of two quantities