Across
1
Middle value in an ordered dataset
5
Number less than zero
6
The number representing nothing
7
Corner point of a polygon
10
Closed shape with straight sides
12
Proven mathematical statement
13
Symbol representing unknown value
Down
2
Part of a line with two endpoints
3
Power to which a number is raised
4
Comparison of two quantities
8
Exact correspondence on both sides
9
Number with digits after a point
11
Sum divided by count