Across
1
Space between two intersecting lines
4
Reference line in a graph
7
Sum divided by count
8
Middle value in an ordered dataset
9
Split into equal parts
12
Number less than zero
Down
2
Rectangle with four equal sides
3
Line touching circle at one point
5
Math using letters for unknown values
6
Number with digits after a point
10
Part of a whole number
11
Number divisible only by 1 and itself