Convert polar equation to rectangular by completing the square

The video tutorial explains how to manipulate an equation involving R and Theta by multiplying both sides by R, leading to a form that allows completing the square. This process reveals a circle with a radius of two, shifted two units to the right. The tutorial concludes with a recap of the steps and encourages students to verify the results using a calculator.

How is the equation transformed when completing the square?

What is the significance of the radius mentioned in the context of the circle?