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daca roata unei trasuri are diametrul de 80 cm, calculeaza lungimea circumferintei rotii

Răspuns :

[tex]L_{cerc}=2 \pi R[/tex]
[tex]d=2R=>R= \frac{d}{2}= \frac{80}{2}=40cm[/tex]
[tex]L_{cerc}=2 \pi R=2 \pi *40cm=80 \pi cm[/tex]