Answer:
2/3 is the scale factor.
Explanation:
10/15=2/3
8/12=2/3
6/9=2/3
3/2
The ratio of corresponding sides of DEF to those of ABC is ...
9/6 = 12/8 = 15/10 = 1.5 = 3/2
Triangle DEF is 1.5, or 3/2 times the size of triangle ABC.
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