Answer:
The sides are divided by 2.
Explanation:
12/2=6, and 5/2 is half of 5.
Answer: 1/2
Since the triangle was rotated, match the long side with 6 with 12 and the short side of 5/2 with 5. It is clearly visible that the scale factor is 1/2 since both numbers were divided by 2.
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