L = 2*π*30*18°/360° = 3*π cm
L' = 3*3,14 = 9,42 cm
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Arco $l= \dfrac{r·π·α}{180°} = \dfrac{30×π×18°}{180°} = 3π~cm$;
oppure:
arco $l= \dfrac{30×3,14×18°}{180°} = 9,42~cm$.
@gramor 👍👍
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