Across
1
Proven mathematical statement
5
Total distance around a shape
7
Closed shape with straight sides
8
Number greater than zero
12
Space between two intersecting lines
Down
2
Sum divided by count
3
Split into equal parts
4
Number less than zero
6
Number that divides evenly into another
9
Exact correspondence on both sides
10
Rectangular array of numbers
11
Value that does not change
13
Difference between highest and lowest values