Given that PA is perpendicular to the plane of rectangle ABCD, AB is equal to four, BC is equal to three, PA is equal to one, the distance from P to straight line BD is
Make AE vertical BD through a, connect PE, ad = 3, ab = 4, get AE = 12 / 5, Pythagorean theorem, pa2 + AE2 = Pe2, get PE = 13 / 5