AC 15 CE6 DE 10 Panjang be adalah

BE/DE = BC/AC
BE/10 = (BE + 6)/15
15BE = 10(BE + 6)
15BE = 10BE + 60
15BE - 10BE = 60
5BE = 60
BE = 60 / 5
BE = 12 cm

be:be+6=10:15
15 be = 10 be + 60
15be-10be = 60
5be=60
be = 12