Across
1
Rectangular array of numbers
4
Rectangle with four equal sides
5
Amount of space an object occupies
7
U-shaped curve of a quadratic function
9
Total distance around a shape
Down
2
Space between two intersecting lines
3
Number with digits after a point
6
Value that does not change
8
Difference between highest and lowest values
10
Sum divided by count
11
Math using letters for unknown values
12
The number representing nothing