横向
1
Number less than zero
6
Corner point of a polygon
7
Mathematical statement of equality
10
Part of a line with two endpoints
11
Number that divides evenly into another
13
Amount of space an object occupies
纵向
2
Distance from center to edge of circle
3
Round shape with all points equidistant
4
Space between two intersecting lines
5
Number divisible only by 1 and itself
8
Split into equal parts
9
Divisible by two
12
Steepness of a line