To convert a complex number from rectangular form (a + bi) to polar form (r ∠ θ), follow these steps:

- Identify the real part (a) and the imaginary part (b) of the complex number.
- Calculate the magnitude (r) of the complex number using the formula: r = √(a^2 + b^2).
- Determine the angle (θ) of the complex number using the formula: θ = tan inverse (b / a). Note: The atan function calculates the arctangent of the ratio b/a, taking into account the quadrant of the complex number.