Across
1
Divisible by two
2
Total distance around a shape
4
Three-sided polygon
6
Split into equal parts
7
Single numeral from 0 to 9
9
Value that does not change
11
Space between two intersecting lines
Down
2
Number greater than zero
3
Number with digits after a point
5
Collection of distinct elements
8
Line segment connecting two circle points
10
Power to which a number is raised