Across
1
Math using letters for unknown values
3
Number greater than zero
4
Number divisible only by 1 and itself
5
Closed shape with straight sides
6
Line segment connecting two circle points
7
Collection of distinct elements
8
Distance from center to edge of circle
9
Value that does not change
Down
2
Difference between highest and lowest values
3
Lines that never intersect
4
U-shaped curve of a quadratic function
10
Divisible by two
11
Number with digits after a point
12
Repeated addition