D = (7, -3)
E = (10, 6)
g = Line(D, E)
k = 0.8660254037844386
A = Intersect(xAxis, yAxis)
B = Point(g)
φ = 0.5235987755982988 rad
C_1 = Rotate(B, φ, A)
C = Dilate(C_1, k, A)
P, c, a, b = Polygon(A, B, C)