Across
1
Value that does not change
3
Result of addition
4
Split into equal parts
6
Rectangular array of numbers
8
Exact correspondence on both sides
10
Total distance around a shape
Down
2
Line touching circle at one point
3
Collection of distinct elements
5
Number divisible only by 1 and itself
7
Reference line in a graph
9
Sum divided by count
11
Number less than zero