Across
1
Number greater than zero
5
Space between two intersecting lines
6
Number less than zero
7
Three-sided polygon
9
Mathematical rule or equation
Down
1
Lines that never intersect
2
Reference line in a graph
3
Single numeral from 0 to 9
4
Exact correspondence on both sides
8
Mathematical statement of equality
10
Number divisible only by 1 and itself
11
Distance from center to edge of circle
12
Round shape with all points equidistant
13
Power to which a number is raised