Across
1
Middle value in an ordered dataset
4
Number greater than zero
6
Exact correspondence on both sides
7
Part of a whole number
9
Corner point of a polygon
Down
2
Part of a circle's circumference
3
Result of addition
5
Repeated addition
7
Number that divides evenly into another
8
Symbol representing unknown value
10
Line segment connecting two circle points
11
Value that does not change
12
Sum divided by count