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A= (p•ap)/2
Despejamos Perímetro (p)
p= 2A/a
p= 2(240) / 12
p= 480/12
p= 40 cm
Ahora buscados el lado (L)
p= 5×L
Despejamos L
L= P/5
L= 40/5
L= 8 cm