In this way, as θ increases in the range 0° ≤ θ < 180°, the line L(θ) represents a line's worth of distinct lines in the plane.
Vì vậy, khi θ tăng trong phạm vi 0° ≤ θ < 180°, đường thẳng L(θ) represents a line's worth of distinct lines in the plane.