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Whats the working to calculate the answer for the length of the line BC

Whats the working to calculate the answer for the length of the line BC-example-1
User Roadkillnz
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Is basically when he said, thats correct what he answered
User Maxim Kornilov
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Hello,
let's use the theorem of Thalès:

4/6=BC/9==>BC=6

User Davis King
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