Across
1
Closed shape with straight sides
3
Middle value in an ordered dataset
4
Math using letters for unknown values
6
Longest side of a right triangle
9
Collection of distinct elements
10
Round shape with all points equidistant
12
Part of a circle's circumference
Down
2
Line segment connecting two circle points
3
Repeated addition
5
Amount of space an object occupies
7
Value that does not change
8
Part of a line with two endpoints
11
Difference between highest and lowest values