Answer:
(c) scale factor of 1/2
Explanation:
You want the scale factor that caused triangle D with sides 12, 16, 20 to be dilated to triangle D' with sides 6, 8, 10.
Scale factor
The scale factor is the ratio of image side lengths to the corresponding preimage side lengths:
D'/D = 6/12 = 1/2 . . . . . . ratio of shortest sides
The scale factor used is one-half (1/2), matching choice C.
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