To see if they are similar, we'll first create a proportion: 12/10 = 18/15. Then, we'll cross-multiply. If the result is the same, then they are similar. If not, then the triangles are not similar: 180 = 180. The triangles are similar, so we can write a similarity statement: Triangle UVW ~ Triangle RST. Then, we can simplify 10/12 to find the scale factor, which is 5/6. Therefore, the answer is option 2.
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