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_8__
A_____B_____C____D todo el segmento mide 40
________40_______ y solo CD mide 8
Ahora plantemos
AB+BC= 40 - 8 a todo el segmento le resto CD
3AB=5BC depejando BC= 3/5AB
sustituimos
AB + (3/5AB) = 32
8/5AB=32 despejando AB
AB= 32*5/8
AB=20