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    • https://espanol.libretexts.org/Matematicas/Geometria/Avi%C3%B3n_Euclideano_y_sus_Familiares_(Petrunin)/20%3A_%C3%81rea/20.07%3A_%C3%81rea_de_tri%C3%A1ngulos_s%C3%B3lidos
      \(\begin{array} {l} {\text{area } (\blacktriangle ABM) = \dfrac{1}{2} \cdot \text{area } (\blacksquare ABEF),} \\ {\text{area } (\blacktriangle CDM) = \dfrac{1}{2} \cdot \text{area } (\blacksquare CDF...\(\begin{array} {l} {\text{area } (\blacktriangle ABM) = \dfrac{1}{2} \cdot \text{area } (\blacksquare ABEF),} \\ {\text{area } (\blacktriangle CDM) = \dfrac{1}{2} \cdot \text{area } (\blacksquare CDFE)} \end{array}\) \(\begin{array} {rcl} {\text{area } (\blacktriangle ABM) \cdot \text{area } (\blacktriangle CDM)} & = & {\dfrac{1}{4} \cdot h_A \cdot h_C \cdot DM \cdot BM =} \\ {} & = & {\text{area } (\blacktriangle BCM) \cdot \text{area } (\blacktriangle DAM)} \end{array}\)

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