Dans un [color=#ff0000][b][i]parallélogramme[/i][/b][/color] :[br][list][*]les [i][b][color=#ff0000]côtés opposés[/color][/b][/i] sont [b][i][color=#ff0000]isométriques[/color][/i][/b] ( AB = DC et AD = BC )[/*][/list] ( [color=#0000ff][i][size=85]pour vérifier appuyer sur le bouton[/size][/i][/color] [size=150][color=#6aa84f][u][i][b]vert[/b][/i][/u][/color][/size])[br][list][*]les [color=#ff0000][b][i]angles[/i][/b][/color] [i][b][color=#ff0000]opposés[/color][/b][/i] sont [b][i][color=#ff0000]égaux [/color][/i][/b][size=150][b][i][color=#ff0000][/color][/i][/b][color=#ff0000][color=#000000]([/color][/color][/size][color=#ff0000][color=#000000] [sub][/sub][/color][/color][b][i][color=#ff0000][color=#000000][sub][img 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[/sub][/color][/color][/i][color=#ff0000][color=#000000][/color][/color][/b][color=#ff0000][color=#000000][size=150])[/size][/color][/color][/*][/list][color=#ff0000] [color=rgb(51, 51, 51)] ( [/color][/color][i][color=#ff0000][color=#0000ff][i][size=85]pour vérifier appuyer sur le bouton[/size][/i][/color] [/color][u][b][color=#0000ff][size=150] blanc[/size][/color][/b][/u][/i][size=150] [size=100])[br][/size][/size][list][*]les [color=#ff0000][b][i]diagonales[/i][/b][/color] se coupent en [color=#ff0000][i][b]leur milieu [/b][/i][color=rgb(51, 51, 51)]( OA = OC et OB = OD )[/color][/color][/*][/list] [color=#ff0000][color=rgb(51, 51, 51)]( [/color][/color][i][color=#ff0000][color=#0000ff][i][size=85]pour vérifier appuyer sur le bouton[/size][/i][/color] [/color][u][b][color=#0000ff][size=150] bleu[/size][/color][/b][/u][/i][size=150] [size=100])[/size][/size] [br][list][*][color=rgb(51, 51, 51)]le point de rencontre des diagonales en est un centre de symétrie .[/color][/*][/list][color=rgb(51, 51, 51)][color=#ff0000][color=rgb(51, 51, 51)] ( [/color][/color][i][color=#ff0000][color=#0000ff][i][size=85]pour vérifier appuyer sur le bouton[/size][/i][/color] [/color][u][b][color=#0000ff][size=150] [color=#ff00ff]rose[/color][/size][/color][/b][/u][/i][size=150] [size=100])[/size][/size][br][/color]