Across
1
Math using letters for unknown values
5
Number less than zero
6
Value that does not change
7
Single numeral from 0 to 9
9
Divisible by two
10
Lines that never intersect
12
Line segment connecting two circle points
13
Power to which a number is raised
Down
2
Line touching circle at one point
3
Part of a whole number
4
Part of a line with two endpoints
8
Number with digits after a point
11
The number representing nothing