Berapa panjang EF? Jika DC 16cm AB 32cm

ABF sebangun dengan DCF
AB/DC = AF/FC
32/16 = AF/FC
2/1 = AF/FC => AF = 2x, FC = x => AC = 2x + x = 3x

Pada ∆ACD
EF/DC = AF/AC
EF/16 = 2x/3x
EF = 2/3 . 16 = 32/3 = 10 2/3