Across
1
Math using letters for unknown values
4
Number greater than zero
7
Line segment connecting two circle points
8
Result of addition
11
Power to which a number is raised
Down
2
Rectangle with four equal sides
3
Line crossing from corner to corner
5
Part of a whole number
6
Exact correspondence on both sides
8
Steepness of a line
9
Line touching circle at one point
10
Number that divides evenly into another