Across
1
Sum divided by count
3
Number divisible only by 1 and itself
5
Collection of distinct elements
6
Number that divides evenly into another
7
Round shape with all points equidistant
8
Math using letters for unknown values
Down
2
Lines that never intersect
3
Closed shape with straight sides
4
The number representing nothing
9
Steepness of a line
10
Total distance around a shape
11
Rectangular array of numbers