Across
1
Closed shape with straight sides
4
Rectangular array of numbers
6
Divisible by two
7
Total distance around a shape
11
Number greater than zero
12
Round shape with all points equidistant
Down
2
Visual representation of data
3
Math using letters for unknown values
5
The number representing nothing
8
Symbol representing unknown value
9
Lines that never intersect
10
Collection of distinct elements