Across
1
Space between two intersecting lines
3
Steepness of a line
4
Part of a line with two endpoints
6
Value that does not change
7
Math using letters for unknown values
10
Split into equal parts
Down
2
Lines that never intersect
3
System of ordered marks for measuring
5
Proven mathematical statement
8
Symbol representing unknown value
9
U-shaped curve of a quadratic function
11
Divisible by two