This document discusses different techniques for drawing circles in computer graphics, including Cartesian coordinates, polar coordinates, and the midpoint circle algorithm. Cartesian coordinates directly use the circle equation to plot points, but is inefficient due to calculations and gaps. Polar coordinates express the circle in parametric form using angle and radius, which solves the gap issue but still requires floating-point calculations. The midpoint circle algorithm derives a decision parameter to iteratively select the next point using integer increments, making it the most efficient method.