C-04-Q020mediumsingle_mcqIn Construction 3, since AP=ACAP = ACAP=AC, we obtain —aAB−AC=AB−AP=dAB - AC = AB - AP = dAB−AC=AB−AP=dbAB+AC=dAB + AC = dAB+AC=dcAB=ACAB = ACAB=ACdAC=aAC = aAC=a