Across
1
Number less than zero
3
Reference line in a graph
5
Part of a circle's circumference
6
Symbol representing unknown value
9
Longest side of a right triangle
11
Corner point of a polygon
Down
2
Visual representation of data
3
Sum divided by count
4
Divisible by two
7
Number greater than zero
8
Three-sided polygon
10
Space between two intersecting lines
12
Distance from center to edge of circle
13
Math using letters for unknown values