Curated OER
Math Handbook: Trigonometry
You'll be spinning in unit circles once you read through this jumbo-sized resource of everything you need to know about trigonometry. Each page has color-coded examples with explicit directions that detail the problems and...
Curated OER
Pre-Calculus Review Sheet
Pre-Calculus has some detailed formulas involved and here is a great resource that lumps then all together for you. Broken up into rectangular, polar, and parametric sections, the conics all include formulas and graphs.
Johan Claeys
Math Abundance: Polar Coordinates of a Point P
Defines a polar coordinate, pole, and polar axis. Includes graph.
Other
Dans Math: Lessons: Trigonometry
College professor Dan Bach reviews basic trig concepts, including trig functions, right triangles, circles, radians, and polar coordinates. Site includes animated graphs and detailed examples.
Wolfram Research
Wolfram Math World: Conchoid of Nicomedes
This site gives an approximate date at which the cochoid was studied by Nicomedes, explains what the locus of points are which make up this curve, and give cartesian and polar coordinates for such a curve, as well as a formula for the...
Other
Stat Soft: Statistics Glossary
Dozens of statistical terms are defined and illustrated in this glossary.