△MNP is similar to △RST. The median from N to MP is 7cm and the corresponding median from S to RT is 4.2cm. If MN=12.6cm and NP=10.8cm, answer the following:
a. (i) Determine the scale factor from △RST to △MNP.
b. (ii) Find the lengths of RS and ST.
c. (iii) Compute the ratio of the areas of the two triangles.