Answer
5
Work Step by Step
$d(P, R)=\sqrt{(x_{2}-x_{\mathrm{I}})^{2}+(y_{2}-y_{1})^{2}}$
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$P(0,0), R(-3,4),$
$d(P, R)=\sqrt{(-3-0)^{2}+(4-0)^{2}}$
$=\sqrt{9+16}=\sqrt{25}=5$
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