Respostas

2014-05-28T14:58:35-03:00
360º   ------ 2 \pi r=2. \pi .2=4 \pi  cm
270º   ------     x

 \frac{360}{270} = \frac{4 \pi}{x}

\frac{90}{270} = \frac{\pi }{x}

\frac{1}{3} = \frac{\pi }{x}

x=3 \pi =3.(3,14)=9,42 cm