Given a point p₀ = (x_0, y₀₎, the right horizontal ray from p₀ is the set of points {p_i = (x_i, y_i) : x_i ≥ x₀ and y_i = y₀}, that is, it is the set of points due right of p₀ along with p₀ itself. Show how to determine whether a given right horizontal ray from p₀ intersects a line segment p₁p₂ in O(1) time by reducing the problem to that of determining whether two line segments intersect.