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Use proportions or scale factors to determine the missing side length.

Use proportions or scale factors to determine the missing side length.-example-1

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It’s gonna be 11.25. To find the scale factor, take 15 and divide by 4, you get 3.75, that’s your scale factor. So now you take 3 and multiply it by your scale factor of 3.75 and you get 11.25. I hope this helps
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User Thalisk
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