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(3AB + 32)/5 = 14
70 = 3AB + 32
38 = 3AB
AB = 38/3 = 12,7 cm
Pembahasan
Δ AOB , Δ DOC dan Δ EOF saling sebangun
(2+ y)/(5+y) = 14/16
(2+ y)/(5+y) = 7/8
8(2+ y) = 7(5+y)
16 + 8y = 35 + 7y
y = 19 cm , y = panjang OB
Karena sebangun ,maka
OF/ OB = EF/AB
(19+2)/19 = 14/AB
21/19 = 14/AB
21 AB = 19 × 14
AB = (19×14)/21
AB = (19×2)/3
AB = 38/3
AB = 12,7 cm
Jawab
Panjang AB adalah 12,7 cm
Catatan
Ini adalah soal UN SMP tahun kemarin
Selamat belajar!
@Wello1☺☺☺