Jika jarak AD=9cm, maka panjang DC adalah... #Tolong pake cara ya...

DC/BC = AD/AB
DC/13 = 9/15
DC = 13x9/15
DC = 117/15
DC= 7,8

konsep Phytagoras
jadi, BD^ = AB^ - AD^
BD^ = 15^ - 9^
BD^= 225 - 81
BD^ = 144
BD = √144
BD = 12

maka DC^=BC^-BD^
DC^ = 13^ - 12^
DC^ = 169 - 144
DC^ = 25
DC = √25
DC = 5

benar