AC = Radical din BCxBC-ABxAB = radical 625-225=20 cm
sinus ABC = AC/BC = 20/25 = 4/5
In triunghiul ABD sinus ABD = sinus ABC = AD/AB=AD/15=4/5
AD/15=4/5 rezulta AD = 15x4/5=12 cm
BD= radical ABxAB-ADxAD=radical 225-144 = 9 rezulta DC = BC-BD = 25-9 = 16 cm