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largo=x o lo que es lo mismo largo=2x ancho=x
entonces:
2x(x)=800
2x²=800
x²=800/2
x²=400
√x²=√400
x=20 x= -20
valor positivo............
x=20
2x............2(20)=40
el largo mide 40 m y el ancho mide 20 m