Across
1
Symbol representing unknown value
5
Difference between highest and lowest values
6
Line crossing from corner to corner
7
Longest side of a right triangle
10
Line segment connecting two circle points
Down
2
Math using letters for unknown values
3
Single numeral from 0 to 9
4
Closed shape with straight sides
5
Comparison of two quantities
8
Split into equal parts
9
Lines that never intersect
11
Rectangle with four equal sides