bantu saya kak plis buat remedi

4.
BE/BD = BC/AB
BE/7 = (BE + 4)/12
12BE = 7(BE + 4)
12BE = 7BE + 28
12BE - 7BE = 28
5BE = 28
BE = 28/5
BE = 5,6 cm (C)

5.
PS/ST = PQ/QR
PS/8 = (PS + 3)/12
12PS = 8(PS + 3)
12PS = 8PS + 24
12PS - 8PS = 24
4PS = 24
PS = 24/4
PS = 6 cm (A)