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Question Number 131733 by LYKA last updated on 07/Feb/21

find the minimum distance  between the point (1,1,1) and  the plane x+2y+3z=6

$$\boldsymbol{{find}}\:\boldsymbol{{the}}\:\boldsymbol{{minimum}}\:\boldsymbol{{distance}} \\ $$$$\boldsymbol{{between}}\:\boldsymbol{{the}}\:\boldsymbol{{point}}\:\left(\mathrm{1},\mathrm{1},\mathrm{1}\right)\:{and} \\ $$$$\boldsymbol{{the}}\:\boldsymbol{{plane}}\:\boldsymbol{{x}}+\mathrm{2}\boldsymbol{{y}}+\mathrm{3}\boldsymbol{{z}}=\mathrm{6} \\ $$$$ \\ $$

Answered by physicstutes last updated on 07/Feb/21

 d = ∣((ax_1 +by_1  + cz_1 −D)/( (√(a^2 +b^2 +c^2 ))))∣  ⇒ d = ∣(((1)(1) +2(1) +3(1)−6)/( (√(1^2 +2^2 +3^2 ))))∣ = 0  since the point in question (1,1,1) lies on the plane  hence it has a minimum distance of 0 units from the   given plane.

$$\:{d}\:=\:\mid\frac{{ax}_{\mathrm{1}} +{by}_{\mathrm{1}} \:+\:{cz}_{\mathrm{1}} −{D}}{\:\sqrt{{a}^{\mathrm{2}} +{b}^{\mathrm{2}} +{c}^{\mathrm{2}} }}\mid \\ $$$$\Rightarrow\:{d}\:=\:\mid\frac{\left(\mathrm{1}\right)\left(\mathrm{1}\right)\:+\mathrm{2}\left(\mathrm{1}\right)\:+\mathrm{3}\left(\mathrm{1}\right)−\mathrm{6}}{\:\sqrt{\mathrm{1}^{\mathrm{2}} +\mathrm{2}^{\mathrm{2}} +\mathrm{3}^{\mathrm{2}} }}\mid\:=\:\mathrm{0} \\ $$$$\mathrm{since}\:\mathrm{the}\:\mathrm{point}\:\mathrm{in}\:\mathrm{question}\:\left(\mathrm{1},\mathrm{1},\mathrm{1}\right)\:\mathrm{lies}\:\mathrm{on}\:\mathrm{the}\:\mathrm{plane} \\ $$$$\mathrm{hence}\:\mathrm{it}\:\mathrm{has}\:\mathrm{a}\:\mathrm{minimum}\:\mathrm{distance}\:\mathrm{of}\:\mathrm{0}\:\mathrm{units}\:\mathrm{from}\:\mathrm{the}\: \\ $$$$\mathrm{given}\:\mathrm{plane}. \\ $$

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