Across
1
Repeated addition
3
Collection of distinct elements
6
Line segment connecting two circle points
7
Mathematical statement of equality
8
Total distance around a shape
10
Closed shape with straight sides
13
Lines that never intersect
Down
2
Math using letters for unknown values
4
Comparison of two quantities
5
Exact correspondence on both sides
6
Round shape with all points equidistant
9
Proven mathematical statement
11
Difference between highest and lowest values
12
Divisible by two