Tolong kerjakan dong

2.
a. ABC ~ ADE karena BC / DE = AB / AD = AC / AE
b. 5AC = 2AE
     AE / AC = 5 / 2
    
     (18+BD) / 18 = AE / AC
     (18 + BD) / 18 = 5 / 2
     2(18 + BD) = 5 x 18
     36 + 2BD = 90
       2BD = 90 - 36
       2 BD = 54
       BD = 54 / 2
       BD = 27 cm

c. DE / BC = AE / AC
    30 / BC = 5 / 2
     5 BC = 30 x 2
     5 BC = 60
        BC = 60 / 5
        BC = 12 cm