GCSE Edexcel Circles, sectors and arcs - Edexcel Area of a circle The circumference of a circle is its outside edge, and is the same distance from the centre at every point along its length.

Any point P with coordinates (x, y) on the circumference of a circle can be joined to the centre (0, 0) by a straight line that forms the hypotenuse of a right angle triangle with sides of length ...

Archimedes' method 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 ...