Across
1
Space between two intersecting lines
3
Symbol representing unknown value
4
Value that does not change
5
Rectangular array of numbers
7
Difference between highest and lowest values
9
Number with digits after a point
11
Rectangle with four equal sides
Down
1
Math using letters for unknown values
2
Exact correspondence on both sides
4
Line segment connecting two circle points
6
Sum divided by count
8
Parts per hundred
10
Part of a circle's circumference
12
Power to which a number is raised