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28 ====> Base Menor
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/ 12 | \ 20 ==> lado oblicuo
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- b - 28 - b -
Utiliza teorema de pitagoras para hallar la base
b² = c² - a²
b² = 20² - 12²
b² = 400 - 144
b² = 256 ===> Extraer la raiz del ejercicio
b = √256
b= 16
La BASE MAYOR seria
16+28+16 = 60 cm
El PERIMETRO ES LA SUMA DE LOS LADOS
28 + 20 + 60 + 20 = 168
Espero que te sirva