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 Jul 13 accepted What does it matter that this angle is the smallest between these two vectors? Jul 12 accepted Finding the intersection point between two lines using a matrix Jul 12 comment Finding the intersection point between two lines using a matrix Even if I only need two rows, if a third one happens to have an inconsistency, will that cause the equation to have no solution? Jul 12 asked Finding the intersection point between two lines using a matrix Jul 12 asked What does it matter that this angle is the smallest between these two vectors? Jun 22 awarded Notable Question Jun 15 accepted Getting the number of significant digits in a multiplication/division. Jun 15 asked Getting the number of significant digits in a multiplication/division. Jun 14 accepted Get the mass of air given the dimensions of a room. Jun 14 asked Get the mass of air given the dimensions of a room. May 9 awarded Notable Question May 7 awarded Famous Question May 7 awarded Notable Question May 6 awarded Famous Question Apr 20 awarded Popular Question Apr 11 awarded Nice Question Feb 6 awarded Popular Question Jan 13 awarded Yearling Dec 12 awarded Notable Question Oct 25 comment Does the line $(2,1,1)+t(-3,1,5)$ live within the plane $31x+3y+18z=62$? @Galc127: The formula you posted, is that for calculating the orthogonal projection? In that case, don't I have to multiply the result by $(31,3,18)$, and then calculate the magnitude of the result?