Across
1
Exact correspondence on both sides
3
Line crossing from corner to corner
7
Space between two intersecting lines
9
Lines that never intersect
10
Value that does not change
Down
1
Collection of distinct elements
2
Amount of space an object occupies
4
Line segment connecting two circle points
5
Line touching circle at one point
6
Distance from center to edge of circle
8
Rectangular array of numbers
9
U-shaped curve of a quadratic function
11
Divisible by two
12
Math using letters for unknown values