Across
1
Line touching circle at one point
4
Middle value in an ordered dataset
5
Divisible by two
7
Line segment connecting two circle points
9
Symbol representing unknown value
11
Longest side of a right triangle
12
Math using letters for unknown values
Down
2
Lines that never intersect
3
Steepness of a line
6
Three-sided polygon
8
Total distance around a shape
10
Line crossing from corner to corner