Across
1
Reference line in a graph
3
Difference between highest and lowest values
7
Line segment connecting two circle points
8
Longest side of a right triangle
10
Closed shape with straight sides
11
Total distance around a shape
Down
2
Number with digits after a point
4
Round shape with all points equidistant
5
Part of a circle's circumference
6
Line touching circle at one point
9
Symbol representing unknown value