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a = 3b/4
70 = 2*(3b/4) + 2b
70 = (6b/4) + 2b
70 = (6b/4) + (8b/4) = 14b/4
b = 70*4/14 = 20
20*3/4 = 15
perímetro = 2*20 + 2*15 = 40+30 = 70
Respuesta:
20 cm