Boa tarde!

A) 60°

πRad------180°

  x----------60°

180x=60

x=60/180 → 30/90 → 15/45 → 5/15 = 1/3πRad

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Utilizaremos o mesmo método da alternativa (a), ou seja, todos serão divididos por 180°.

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B) 15°

15/180 → 5/60 = 1/12πRad

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C) 75°

75/180 → 25/60 → 5/12πRad

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D) 225°

225/180 → 75/60 → 25/20 = 5/4πRad

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E) 240°

240/180 → 120/90 → 60/45 → 20/15 = 4/3πRad

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Att;Guilherme Lima