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Une horloge a une grande aiguille de 10 cm de long.Quelle distance la pointe de cette grande aiguille parcourt-elle en 12 heures?

 Apr 22, 2021
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 If a clock has a large hand 10 cm long, how far does the tip of this large hand travel in 12 hours?

 

in 12 hours, the minute hand moves 12 circle exactly.

 

radius=10

 

circumference=2r$\pi$=2$\cdot$10$\cdot\pi$=20$\pi$

 

20$\pi\cdot$12=$\boxed{240\pi}$

 Apr 22, 2021
edited by SparklingWater2  Apr 22, 2021
edited by SparklingWater2  Apr 22, 2021
edited by SparklingWater2  Apr 22, 2021

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