Across
1
Power to which a number is raised
5
Part of a circle's circumference
7
Space between two intersecting lines
8
Exact correspondence on both sides
9
Line crossing from corner to corner
10
Comparison of two quantities
11
Difference between highest and lowest values
Down
2
Rectangular array of numbers
3
Symbol representing unknown value
4
Longest side of a right triangle
6
Line segment connecting two circle points
12
Result of addition