Perhatikan gambar berikut. panjang DE adalah​

AE / EC = AE / DB

(5x – 1) / 3x = 8 / 5

8(3x) = 5(5x – 1)

24x = 25x – 5

24x – 25x = -5

-x = -5

x = 5

Panjang BC

= 4x + 6

= 4(5) + 6

= 20 + 6

= 26 cm

DE / BC = AD / AB

DE / 26 = 8 / 13

DE = 8/13 x 26

DE = 16 cm

Jawaban E