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Observa la següent construcció i troba el lloc geomètric dels punts [b][color=#38761d]F[/color][/b] i [b][color=#3c78d8]D[/color][/b] si movem la semirecta [color=#980000][b]f [/b][/color]amb el punt [color=#1e84cc][b]P[/b][/color].