1. The problem statement, all variables and given/known data: Determine the resultant of three vectors of magnitude 1, 2 and 3 whose directions are those of sides of an equilateral triangle taken in order. 2. Relevant equations: R2 = A2 + B2 + 2 A B cos θ tan α = B sin θ/(A+B cos θ) 3. The attempt at a solution: https://drive.google.com/open?id=0B3IenBvKWb4PUG9kTUctcFJyLUk The correct answer is: 1.732 units at an angle of 210 ° to the first vector. I have calculated the magnitude correctly but cannot match the direction.