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 ...

Forbes contributors publish independent expert analyses and insights. I write about mathematics and its applications The area and perimeter ratios are shown and as n ...

A Japanese mental health counsellor has broken the world record for reciting pi, the ratio of the circumference of a circle to its diameter, from memory. Akira Haraguchi, 59, managed to recite the ...