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la base mide 2/5 de la altura, y la altura mide 8 cm, por lo tanto:
base = (2/5)(8) = 16/5 = 3.2 cm
por lo tanto el perímetro es:
p = 2*base + 2*altura
p = 2*3.2 + 2*8
p = 6.4 + 16
p = 22.4 cm
el área es :
a = base*altura
a = 3.2*8
a = 25.6 cm^2