ΔPQR has sides PQ = 4 cm, QR = 6 cm and PR = 8 cm. ΔSTU has sides ST = 6 cm, TU = 9 cm and SU = 12 cm.
(i) Verify whether the two triangles are similar and state the similarity criterion used.
(ii) Write the correct order of correspondence between the vertices of the two triangles.
(iii) Determine the scale factor from ΔPQR to ΔSTU.