Across
1
Reference line in a graph
4
Line crossing from corner to corner
5
Exact correspondence on both sides
6
Power to which a number is raised
9
Single numeral from 0 to 9
Down
2
Collection of distinct elements
3
Value that does not change
7
Symbol representing unknown value
8
Middle value in an ordered dataset
10
Number divisible only by 1 and itself
11
Longest side of a right triangle