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sudut EAD = sudut BAC ( bersekutu)
sudut AED = sudut ABC (dalam berseberangan)
sudut ADE = sudut ACB (dalam berseberangan)
krn sudut" yang bersesuaian sama besar maka Δ AED sebangun dengan Δ ABC
AE : AB = ED : BC
AE : (AE + EB) = ED : BC
AE : (AE + 6) = 4 : 10
10 .AE = 4 (AE + 6)
10.AE = 4.AE + 24
10.AE - 4.AE = 24
6.AE = 24
AE =
AE = 4 cm