The circumference of a circle is the distance around the shape. The ability to round a number to a number of decimal places or to a number of significant figures means that answers can be written to ...

Thread Circle explores the formulas for the area and circumference of circles. In doing so, we acquire more then just a few equations but also gain a model for breaking apart complexity and taking on ...

Scientific American presents Math Dude by Quick & Dirty Tips. Scientific American and Quick & Dirty Tips are both Macmillan companies. Throughout history, circles have symbolized many things: unity, ...