Answer:
30
Explanation:
20 divided by 8 is 2.5, so you know that the triangle expanded by 2.5.
Multiply the small triangle's length by 2.5 to get your answer of 30.
30 centimeters
You have to find the scaling of the lengths first, and to do that, you divide the 20 by 8, which would be 2.5. After, you multiply 2.5 by 12 to get your answer.
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