Respostas

2014-05-03T01:21:09-03:00
360^{o} ------ 2 \pi r
85^{o}    ------    x

 \frac{360^{o}}{85^{o}} = \frac{2.(3,14).4}{x}

 \frac{90}{85} = \frac{2.(3,14)}{x}

 \frac{45}{85} = \frac{3,14}{x}

 \frac{9}{17} = \frac{3,14}{x}

x= \frac{(3,14).17}{9} =5,93 cm aproximadamente.
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