Any point P with coordinates (\(x,~y\)) on the circumference of a ... This means that, using Pythagoras’ theorem, the equation of a circle with radius \(r\) and centre (0, 0) is given by the ...

Simply enough, pi is the ratio of a circle's circumference ... with the equation below, where phi (φ) is the 'golden ratio' (itself an irrational number equal to 1.6180339887...), theta (θ ...