Across
1
Symbol representing unknown value
5
Mathematical statement of equality
6
Math using letters for unknown values
7
Closed shape with straight sides
12
Parts per hundred
Down
2
Line touching circle at one point
3
Lines that never intersect
4
Split into equal parts
8
Part of a circle's circumference
9
Collection of distinct elements
10
Exact correspondence on both sides
11
Total distance around a shape