Across
1
Symbol representing unknown value
4
Number divisible only by 1 and itself
5
Amount of space an object occupies
6
U-shaped curve of a quadratic function
8
Value that does not change
Down
2
Lines that never intersect
3
Total distance around a shape
4
Closed shape with straight sides
7
Number that divides evenly into another
9
Round shape with all points equidistant