Across
1
Distance from center to edge of circle
3
Part of a line with two endpoints
4
Lines that never intersect
5
The number representing nothing
6
Steepness of a line
11
Line segment connecting two circle points
12
Mathematical statement of equality
Down
2
Parts per hundred
3
Rectangle with four equal sides
7
Three-sided polygon
8
Number with digits after a point
9
Sum divided by count
10
Value that does not change