Across
1
Amount of space an object occupies
4
Reference line in a graph
6
Exact correspondence on both sides
7
Collection of distinct elements
8
Number less than zero
11
Line crossing from corner to corner
Down
2
Mathematical statement of equality
3
Repeated addition
5
Divisible by two
9
Distance from center to edge of circle
10
Line segment connecting two circle points
12
Round shape with all points equidistant