Across
1
Middle value in an ordered dataset
2
Result of raising a number to an exponent
4
Lines that never intersect
5
Line touching circle at one point
6
Repeated addition
8
Sum divided by count
9
Steepness of a line
Down
2
Number divisible only by 1 and itself
3
Distance from center to edge of circle
4
Total distance around a shape
7
Collection of distinct elements
10
The number representing nothing
11
Closed shape with straight sides
12
Value that does not change