arcs

Drawing an arc with the canvas
Arc drawing, radial gradients, stacked canvases, auto-sized canvas, ping-pong and range generators
SVG arc
Generators, degrees-to-radians, updating SVG, auto-sized element
Moving along an arc
Relative point calculation, DOM element translate, ping-pong generator, degrees-to-radians

circles

Drawing a circle with the canvas
Circle drawing, radial gradients, shape drawing function, auto-sized canvas, ping-pong generator
SVG circle: Animate an SVG circle
SVG, pointer event
SVG circle path: Animate text on a circular path
SVG
Math: Nearest point on circle perimeter
Circle functions
Sunflower: Calculate points using a Vogel spiral, making a sunflower pattern.
Generators
Ring: Distribute elements around a circle
Polar coordinates

Spiral: Draws a spiral based on polar coordinates and generators
Generators, canvas paths, ping-pong
Orbit: Move an element in a circular orbit with polar coordinates
Polar, animation

Drawing: Drawing and animating points
Canvas, points, repeat
Particle: Drawing and animating particles
Canvas, animating points, repeat, jitter
Interpolate: Reach a target point over time
Interpolation, pointer events, relative coordinates
Math: Calculate relative coordinates, and compute distance and angle between two points
Pointer events, Points.distance, Points.angle
Angle Avg: Calculates average angle in a stream of points
Number and point tracker
Centroid and Hull: Centroid of two or more points, as well as enclosing shape
Points.centroid, Points.convexHull, Pointer events, relative coordinates
Relation: Track angle, distance, centroid between two points
Points.relation, Pointer events, relative coordinates
Dot product: Calculate similarity between vectors
Points.dotProduct