Hmmm. . .the easiest way I can think of is to turn the circle into a polygon, clip using the rectangle, and then calculate the remaining area.

In a circle packing problem, the goal is to maximize the packing fraction: the ratio of space covered by disks to the total area within the domain. Traditional algorithms tackle disk packing by ...

Circle is often used in application of computer vision. It is the most essential and most important task to detect circle in measurement based image. Hough transform is used widely in circle detection ...