AB = 18 cm EF = 15 cm DE = 4 cm AE = 8 cm Tentukan panjang DC

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(PD+4) / 15 = (PD+4+8) / 18
18 PD + 72 = 15 PD + 180
3PD = 108
PD = 36
PD/DC = (36+4) / 15
36 / DC = 40/15
DC = 36 x 15 / 40
DC =13,5 cm

AE / DE = AT / EO 8 / 4 = 3 / EO EO = 3 x 4 / 8 EO = 1.5 maka, panjang DC = FO - EO DC = 15 - 1.5 = 13.5 cm