Explanation:
The magnitude of resultant vector in three dimension
If vector A = 4i + 3j + 5k
The calculated magnitude | A | = [tex]\sqrt{4^2 + 3^2 + 5^2}[/tex] = [tex]\sqrt{50}[/tex] = 7
If the angle formed with x-axis by this vector is α
Then cosα = x-component of vector divided by its magnitude
or cosα = [tex]\frac{4}{7}[/tex] = 0.57
and angle α = 35° approx
