tolong dijawab ya kaaaa

segitiga
Δ PQR  sisi sisnya QR, PR dan PQ
p =QR
q =PR
r = PQ

p : q : r = 3 : 2 : 4
r = PQ = 12 cm
p = QR = 3/4 x 12 cm = 9 cm
q = PR = 2/4 x 12 cm  = 6 cm
Keliling  PQ +QR + PR = 12 + 9 + 6 = 27 cm