Across
1
Mathematical rule or equation
3
Line segment connecting two circle points
4
The number representing nothing
5
Round shape with all points equidistant
6
Rectangle with four equal sides
7
Number less than zero
Down
2
Lines that never intersect
3
Value that does not change
8
Closed shape with straight sides
9
Amount of space an object occupies
10
U-shaped curve of a quadratic function
11
Collection of distinct elements