ΔLQP ∼ ΔLNM
LP/LM = PQ/MN
c/(7+c) = 5/12
c = 5(7+c)/12
c x 12 = 35 + 5c
12c = 35 + 5c
12c - 5c = 35
7c = 35
c = 35/7 = 5 cm
ΔPMQ ∼ ΔLMR
MQ/MR = MP/ML
d/(5+d) = 7/12
d = 7/12 x (5+d)
d = (35 + 7d)/12
12d = 35 + 7d
12d - 7d = 35
5d = 35/5 = 7 cm
ΔLQP ∼ ΔLNM
LQ/LN = PQ/MN
e/(14+e) = 5/12
e = 5/12 x (14+e)
e = (70 + 5e)/12
12e = 70 + 5e
12e - 5e = 70
7e = 70
e = 70/7 = 10 cm
ΔPMQ ∼ ΔLMR
RL/QP = ML/MP
f/5 = 12/7
f = 12/7 x 5
f = 60/7 = 8,57 cm
iii) gambar 3 dengan sisi yang dicari p dan q