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the purpose of three broken lines is a triangle!
#1. Spiral Lines #2. Concave Lines #3. Horizontal Lines #4. Diagonal Lines #5. Vertical Lines #6. Broken Lines #7. Zigzag Lines #8. Concave Lines #9. Broken Lines I don't know the 10th but I am gonna research it . . .
No, not always. Skew lines are never coplanar, but parallel lines are.
Parallel lines
They may also be parallel lines.