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i remember doing this last year but i dont know how to solve it

i remember doing this last year but i dont know how to solve it class=

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bartdrinksmalk

The two triangles are similar (because the angle at the top is a right angle), so we have the proportion
\(\frac{4}{8}=\frac{8}{x}\)
\(\rightarrow4x=8*8\)
\(\rightarrow4x=64\)
\(\rightarrow x=16\)

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