Across
1
Space between two intersecting lines
3
Round shape with all points equidistant
4
Collection of distinct elements
5
Comparison of two quantities
6
Mathematical rule or equation
9
The number representing nothing
11
Lines that never intersect
Down
1
Reference line in a graph
2
Total distance around a shape
7
Part of a line with two endpoints
8
Middle value in an ordered dataset
10
Number that divides evenly into another