For a 2D vector ((x, y)), use (sqrt{x^2 + y^2})
For a 3D vector ((x, y, z)), use (sqrt{x^2 + y^2 + z^2})
For a vector (vec{v} = langle a, b rangle), use (|vec{v}| = sqrt{a^2 + b^2})
For a vector (vec{v} = langle a, b, c rangle), use (|vec{v}| = sqrt{a^2 + b^2 + c^2})
Square each component
Add the squared values
Take the square root of the sum
For a scalar magnitude, use the absolute value (|x|)
For displacement, use (sqrt{(Delta x)^2 + (Delta y)^2})
For distance in 3D, use (sqrt{(Delta x)^2 + (Delta y)^2 + (Delta z)^2})