Across
1
Line touching circle at one point
4
Middle value in an ordered dataset
5
Line segment connecting two circle points
8
Rectangle with four equal sides
10
Result of multiplication
11
The number representing nothing
12
Lines that never intersect
Down
2
Line crossing from corner to corner
3
Closed shape with straight sides
4
Repeated addition
6
Proven mathematical statement
7
Part of a whole number
8
Part of a line with two endpoints
9
Total distance around a shape