Across
1
Part of a line with two endpoints
5
Closed shape with straight sides
6
Value that does not change
8
The number representing nothing
11
Lines that never intersect
12
Proven mathematical statement
Down
2
Power to which a number is raised
3
Number divisible only by 1 and itself
4
Middle value in an ordered dataset
7
Distance from center to edge of circle
9
Steepness of a line
10
Rectangular array of numbers