Jawabanmu

2014-05-04T11:55:17+07:00
Menggunakan Pythagoras
DC^2 = (AB+BC)^2 + AD^2
DC =  \sqrt{225+64
     = 17 m
2014-05-04T11:55:59+07:00
S = √8² + (6+9)²
s = √64 + 225
s = 17