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2013-12-04T15:35:03-02:00
Dp,r =  \frac{ax+by+c}{ \sqrt{ a^{2} + b^{2} } }
reta  3x+4y + 7 = 0 a=3, b=4, c=7 
ponto 2,1 .:. x=2 e y =1 
Dp,r =  \frac{3.2+4.1+7}{ \sqrt{9+16} }

Dp,r =  \frac{6+4+7}{5} =  \frac{17}{5}