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Los datos que tienes son:
P = 25 cm
l = 8 cm
b = ?
Calculamos la base del triángulo.
b = P - 2l
b = 25 cm - 2 (8 cm)
b = 25 cm - 16 cm
b = 9 cm
Respuesta.
b = 9 cm
si me dices que el perimetro es 25 cm
entonces
Perimetro = x + x + y
25 = 8 +8 + y
25 = 16 + y
25 - 16 = y
9 = y
la base mide 9 cm