Across
1
Value that does not change
4
Middle value in an ordered dataset
5
Divisible by two
6
Rectangle with four equal sides
8
Rectangular array of numbers
10
Closed shape with straight sides
12
Result of multiplication
Down
2
Distance from center to edge of circle
3
Symbol representing unknown value
6
Exact correspondence on both sides
7
Collection of distinct elements
9
Amount of space an object occupies
11
Difference between highest and lowest values