Cartesian equation of a plane. r →. n → = a →. n → ⤇ n 1 x + n 2 y + n 3 z = n 1 a 1 + n 2 a 2 + n 3 a 3 = d. n 1 x + n 2 y + n 3 z = d. D = | r →. n | = | a →. n |. {=} | a →. n → | n 1 2 + n 2 2 + n 3 2 = |
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