Across
1
Value that does not change
6
Middle value in an ordered dataset
7
Symbol representing unknown value
10
Rectangle with four equal sides
11
The number representing nothing
Down
2
Part of a circle's circumference
3
Lines that never intersect
4
Rectangular array of numbers
5
Divisible by two
8
Round shape with all points equidistant
9
Difference between highest and lowest values