La distancia de los puntos A y B respecto a la recta r es : d(A, r) = 0d(B, r) = √3 unidadesExplicación : Datos ; A = (2, 3, - 1) B = (1, 4, 0) r : (x, y, z) = (1, 3, - 2) + k(1, 0, 1)La distancia de un punto a una recta en r³ ; <img src="https://tex.z-dn.net/?f=d%28P%2Cr%29%20%3D%5Cfrac%7B%7CQP%20x%20v%7C%7D%7B%7Cv%7C%7D" />Siendo ; Q = (1, 3, - 2) v = (1, 0, 1)QA = (2 - 1, 3 - 3, - 1 + 2)QA = (1, 0, 1)<img src="https://tex.z-dn.net/?f=%7CQA%20x%20v%7C%3D%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Di%26j%26k%5C%5C1%260%261%5C%5C1%260%261%5Cend%7Barray%7D%5Cright%5D" /> = 0Esto quiere decir que los vectores son paralelos<img src="https://tex.z-dn.net/?f=d%28P%2Cr%29%20%3D%5Cfrac%7B0%7D%7B%5Csqrt%7B2%7D%7D" /> = 0QB = (1 - 1, 4 - 3, 0 + 2)QB = (0, 1, 2)<img src="https://tex.z-dn.net/?f=%7CQB%20x%20v%7C%3D%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Di%26j%26k%5C%5C0%261%262%5C%5C1%260%261%5Cend%7Barray%7D%5Cright%5D" /> = i(1) - j( - 2) + k( - 1) = (1, 2 , - 1) = √(1² + 2² + ( - 1)²) = √6 |v| = √(1² + 1²)|v| = √2Sustituir ; <img src="https://tex.z-dn.net/?f=d%28B%2Cr%29%20%3D%5Cfrac%7B%5Csqrt%7B6%7D%7D%7B%5Csqrt%7B2%7D%7D" /><img src="https://tex.z-dn.net/?f=d%28B%2Cr%29%20%3D%5Csqrt%7B3%7D" />.