Across
1
Symbol representing unknown value
6
Distance from center to edge of circle
7
Line segment connecting two circle points
8
Part of a whole number
9
Difference between highest and lowest values
10
Total distance around a shape
Down
2
Split into equal parts
3
Line touching circle at one point
4
Math using letters for unknown values
5
Round shape with all points equidistant
11
Number less than zero
12
Number that divides evenly into another
13
Mathematical rule or equation