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Formulario di geometria - Fermi - Gadda

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Figura<br />

Figura<br />

TRIANGOLO EQUILATERO inscritto<br />

Nomenclatura specifica h = altezza<br />

OC = R = raggio della<br />

circonferenza<br />

l = lato del triangolo<br />

S = area<br />

P = perimetro<br />

Formule <strong>di</strong>rette<br />

Formule inverse<br />

TRIANGOLO EQUILATERO CIRCOSCRITTO<br />

H<br />

23<br />

l = √3 R<br />

A = 3 √3 R 2<br />

P = 3 √3 R<br />

R = √3 l / 3<br />

Nomenclatura specifica AH = h = altezza<br />

OH = r = raggio della<br />

circonferenza<br />

l = lato del triangolo<br />

S = area<br />

P = perimetro<br />

Formule <strong>di</strong>rette<br />

Formule inverse<br />

h = 3 r<br />

l = 2 √3 r<br />

A = 12 √3 r 2<br />

P = 18 r<br />

r = h / 3

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