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Piccola storia della trigonometria - Dipartimento di Matematica "U ...

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Teorema <strong>di</strong> Tolomeo<br />

Posto Arco AB=α; AB= ; Arco AC=β AC=<br />

Si ha Arco BC=β­α; BC= ; Arco BD=180­α; BD=180­ ; Arco CD=180­<br />

β<br />

Per il teorema<br />

c(β)c(180­ c( )c(180­α)=c( )=c(α)c(180­ )c(180­ β)+120c( )+120c(β­α)

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