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Step1: Aplicar la proporcionalidad de triángulos semejantes
Si los triángulos son semejantes, entonces \(\frac{DG}{GF}=\frac{DH}{HE}\). Sustituir los valores conocidos: \(\frac{4.8}{7.2}=\frac{8.7}{HE}\).
Step2: Resolver la ecuación para \(HE\)
Multiplicar cruzado: \(4.8\times HE = 7.2\times8.7\). Luego, \(HE=\frac{7.2\times8.7}{4.8}\). Calcular \(7.2\times8.7 = 62.64\). Luego, \(HE=\frac{62.64}{4.8}=13.05\).
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\(13.05\)