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- sudut GDC = CIB
- Sudut DCG = IBC
- Sudut ICB = DGC
DAN SISI
- DG = IC
-CD = IB
- CG = BC
Segitiga DCG sebangun dengan Segitiga HGF KARENA.
- sudut GDC = FHG
- Sudut DCG = HGF
- Sudut DGC = HFG
DAN SISI
- DG = HF
- CD = GH
- CG = FG
Dengan menggunakan teorema pythagoras panjang CG =5 cm
Maka,
- Panjang CI
CI/DG = BC/CG
CI/3 = 4/5
5CI = 12
CI = 12/5
CI = 2,4 cm
- Panjang IB
IB/DC= BC/CG
IB/4 = 4/5
5 IB = 16
IB = 16/5
IB = 3,2 cm
- Panjang HG
HG/DC = FG/GC
HG/4 = 3/5
5HG = 12
HG = 12/5
HG = 2,4 cm = CI
- panjang HF
HF/DG = FG/GC
HF/3 = 3/5
5 HF = 9
HF = 9/5
HF = 1,8 cm