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Geometry Help? FAN N MEDAL
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@eliassaab
it is going to be 30
its should be 60
Um who is right?
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|dw:1418079710168:dw|
\(\large\tt \begin{align} \color{black}{\triangle ADE\approx \triangle ABC\\~\\ \text{hence}\\~\\ \dfrac{ad}{ab}=\dfrac{de}{bc}\\~\\ \color{red}{\text{ad=db , ab=ad+db=2ad}}\\~\\ \dfrac{ad}{2ad}=\dfrac{de}{120}\\~\\ \dfrac{1}{2}=\dfrac{de}{120}\\~\\ de=\dfrac{120}{2}\\de =60 }\end{align}\)
Thanks @mathmath333
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