Across
1
Distance from center to edge of circle
5
Value that does not change
6
The number representing nothing
7
Proven mathematical statement
8
Total distance around a shape
9
Divisible by two
13
Steepness of a line
Down
2
Parts per hundred
3
Single numeral from 0 to 9
4
Longest side of a right triangle
10
Reference line in a graph
11
Closed shape with straight sides
12
Collection of distinct elements
14
Middle value in an ordered dataset