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ancho: x
A=largo*ancho
3x*x=48m²
3x²=48m²
x²=48m²/3
x=√16m² -------- x=4m
SUSTITUIMOS LOS LADOS
largo: 3*4=12m
ancho: 4m
Ahora sacamos el perímetro
P=2(12m)+2(4m)
P=24m+8m
P=192m