Triangle Geometry and Bisectors
Rhombus vertices and coordinates
Let A(1, 2) and C(–3, –6) be two diagonally opposite vertices of a rhombus, whose sides AD an BC are parallel to the line 7x – y = 14. If B (α, β) and D(γ, δ) are the other two vertices, then |α + β + γ + δ| is equal to :