Resposta :

[tex]\dfrac{AB}{CD}=\dfrac{EF}{GH}\Longrightarrow\dfrac{15}{10}=\dfrac{12}{GH}\\\\\\ 15\cdot GH=10\cdot12\\\\ 15\cdot GH=120\\\\ GH=\dfrac{120}{15}\\\\ GH=8\;\text{cm}[/tex]

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