Across
1
Symbol representing unknown value
5
Mathematical statement of equality
6
Total distance around a shape
7
Part of a circle's circumference
11
Space between two intersecting lines
Down
2
Line segment connecting two circle points
3
Math using letters for unknown values
4
Middle value in an ordered dataset
8
Line touching circle at one point
9
Three-sided polygon
10
Number with digits after a point
12
Distance from center to edge of circle
13
Sum divided by count