Across
1
Total distance around a shape
6
The number representing nothing
7
Single numeral from 0 to 9
8
Part of a line with two endpoints
9
U-shaped curve of a quadratic function
Down
2
Line touching circle at one point
3
Comparison of two quantities
4
Number that divides evenly into another
5
Math using letters for unknown values
10
Distance from center to edge of circle
11
Line crossing from corner to corner