Across
1
Number less than zero
6
Mathematical statement of equality
7
Collection of distinct elements
8
The number representing nothing
9
Total distance around a shape
11
Split into equal parts
Down
2
Middle value in an ordered dataset
3
Line crossing from corner to corner
4
Part of a line with two endpoints
5
Proven mathematical statement
6
Divisible by two
10
Single numeral from 0 to 9