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I took a screenshot of this question earlier but it got moderated idk why

 

D is on side AB of ABC We know triangle ABC ~ triangle ACD and we know all the marked side lengths.

What is the length of AB?

 Oct 6, 2021
 #1
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This is very simple.smiley

 

Δ ABC ~ Δ ACD

 

3 / 6 = 6 / BD

 

BD = 12

 

AB = √225

 Oct 7, 2021

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