In △ABC\triangle ABC△ABC, ∠A=90∘,AB=6,AC=8\angle A = 90^\circ, AB=6, AC=8∠A=90∘,AB=6,AC=8. If DDD is on BCBCBC such that AD⊥BCAD \perp BCAD⊥BC, find ADADAD.
4.84.84.8
555
444
4.54.54.5