It finds an approximation of pi by determining the length of the perimeter of a polygon inscribed within a circle (which is less than the circumference of the circle) and the perimeter of a ...

The circumference of a circle is, in turn ... Archimedes used inscribed and circumscribed polygons such as these in his ...

Archimedes determined the upper and lower range of pi by finding the perimeters of inscribed and circumscribed polygons ... to the circumference of the circle and thereby come up with his ...