Across
1
Power to which a number is raised
6
Lines that never intersect
8
Sum divided by count
10
The number representing nothing
11
Distance from center to edge of circle
12
Closed shape with straight sides
Down
2
Comparison of two quantities
3
U-shaped curve of a quadratic function
4
Line touching circle at one point
5
Split into equal parts
7
Part of a line with two endpoints
9
Reference line in a graph
13
Line segment connecting two circle points