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Hvis man har oplyst et punkt [math]\left(x_1,y_1,z_1\right)[/math] og plan [math]\alpha[/math]: ax+by+cz+d=0, så er afstanden mellem dem givet ved [math]dist\left(P,l\right)=\frac{|ax_1+by_1+cz_1+d|}{\sqrt{a^2+b^2+c^2}}[/math] [br]