Across
1
Parts per hundred
3
Reference line in a graph
5
Line crossing from corner to corner
8
U-shaped curve of a quadratic function
9
Power to which a number is raised
10
Part of a circle's circumference
11
Closed shape with straight sides
12
Line segment connecting two circle points
Down
1
Lines that never intersect
2
Single numeral from 0 to 9
4
Comparison of two quantities
6
Total distance around a shape
7
Difference between highest and lowest values