Across
1
Lines that never intersect
5
Rectangle with four equal sides
6
Single numeral from 0 to 9
7
Space between two intersecting lines
8
Rectangular array of numbers
9
Corner point of a polygon
12
Proven mathematical statement
Down
2
Number less than zero
3
Reference line in a graph
4
Part of a line with two endpoints
10
Line segment connecting two circle points
11
Middle value in an ordered dataset