trigonometria

[zenildo]

Um automével percorre 94,20 u.c.sobre uma curva circular descrevendo um arco de pi/3 radianos .Nessas condições, o raio da curva, em u.c., é, aproximadamente, igual a:

a) 100
b) 90 essa questão eu não entendi muito bem não, pois não sei se devo utilizar esta fórmula: l= alpha. r
c) 80
d) 70 Eu penso que, ele já deu pi/3 radianos eu deva transformar em graus, dando: 60°
e) 60

eu faria assim:

l= r. alpha, portanto, r= l/alpha= 1,57, logo não bate com a resposta.

[fjjmg2013]

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