Across
1
Math using letters for unknown values
5
Line crossing from corner to corner
6
Exact correspondence on both sides
11
Value that does not change
Down
2
Closed shape with straight sides
3
Reference line in a graph
4
Rectangle with four equal sides
7
Total distance around a shape
8
Space between two intersecting lines
9
Divisible by two
10
Power to which a number is raised