yang bisa jawab nomor 7 dan 8, pakai cara

7)
AC / BC = AE / DE
(AE + CE) / BC = AE / DE
(16 + CE) / 21 = 16 / 12
(16 + CE) / 21 = 4 / 3
(16 + CE) = 4/3 X 21
16 + CE = 28
CE = 28 - 16
CE = 12 cm

Jawaban D

8)
PT / PS = PR / PQ
PT / (PQ - QS) = (PT + TR) / PQ
PT / (20 - 8) = (PT + 10) / 20
PT / 12 = (PT + 10) / 20
20PT = 12(PT + 10)
20PT = 12PT + 120
20PT - 12PT = 120
8PT = 120
PT = 120 / 8
PT = 15 cm

Jawaban A