Across
1
Exact correspondence on both sides
6
Number that divides evenly into another
7
Mathematical statement of equality
8
Number less than zero
12
Corner point of a polygon
Down
2
Round shape with all points equidistant
3
Proven mathematical statement
4
Rectangular array of numbers
5
The number representing nothing
9
Middle value in an ordered dataset
10
Symbol representing unknown value
11
Sum divided by count
13
Difference between highest and lowest values