Circle a triangle whose base has the length of the circle's circumference and whose height equals the circle's radius, which comes to multiplied by the radius squared: Equivalently, denoting diameter by "d", that is, approximately 79% of the circumscribing square (whose side is of length "d"). The circle is the plane curve enclosing the maximum area for a given arc length. This relates the circle to a problem in the calculus of variations, namely the isoperimetric inequality. Equation of a circle<br> In an "x"–"y" Cartesian coordinate system, the circle with centre coordinates ("a", "b") and radius "r" is the set of
There Is a Light That Never Goes Out the band's "comeback" record. However, Johnny Marr was insistent that "Bigmouth Strikes Again" be the band's next single. Despite Travis's advocation of the song, Simon Goddard expressed doubt that the song's "explicit glamorisation of suicide" would have endeared it to daytime radio. Regardless, "There Is a Light That Never Goes Out" became the second Smiths song to top BBC Radio One disc jockey John Peel's Festive Fifty poll in his 1986 tally. The song was shortly thereafter included on the 1987 compilation album "The World Won't Listen". In October 1992, "There Is a Light That Never Goes Out" finally received