Across
1
Number less than zero
5
Result of raising a number to an exponent
7
Part of a circle's circumference
8
Exact correspondence on both sides
10
Line crossing from corner to corner
11
Line touching circle at one point
Down
2
The number representing nothing
3
Sum divided by count
4
Divisible by two
5
Closed shape with straight sides
6
Power to which a number is raised
9
Reference line in a graph