[color=#0000ff][center][/center][/color][size=150][color=#0000ff][center]OSSERVIAMO CHE:[/center][/color]- un [color=#0000ff]angolo piatto[/color] può essere misurato in gradi (180°) oppure in radianti ([math]\pi[/math])[br]- allo stesso modo [color=#0000ff]qualunque altro angolo[/color] può essere misurato in gradi ([math]\alpha[/math][sub]g[/sub]) o in radianti ([math]\alpha[/math][sub]r[/sub])[br]Il passaggio da un'unità di misura all'altra può essere effettuato facilmente utilizzando la seguente proporzione:[br][center][img 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cui, [color=#ff0000]nota la misura in gradi dell'angolo [color=#ff0000][math]\alpha[/math][/color], la sua misura in radianti[/color] sarà:[br][br][center][img 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[color=#ff0000]nota la misura in radianti dell'angolo [color=#ff0000][math]\alpha[/math][/color], la sua misura in gradi [/color]sarà:[br][br][center][img 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[size=150]Abbiamo visto che:[/size][size=150] [br] ogni numero reale è la misura in radianti di un angolo[br] ogni angolo individua sulla circonferenza goniometrica un solo punto P[br][br]quindi:[br][color=#ff0000]ad ogni numero reale[/color] [color=#ff0000](misura dell'angolo [math]\alpha[/math])[/color] [color=#ff0000]corrisponde un solo punto sulla circonferenza goniometrica.[br][/color][color=#0000ff]Posso affermare anche che ad ogni punto P della circonferenza goniometrica corrisponde la misura di un solo angolo?[/color][/size]