The equation was first proposed by Yamaji Nushizumi in 1751 and has been independently rediscovered multiple times—by Jakob Steiner in 1826, William Beecroft in 1842, and Frederick Soddy in 1936 ...

This equation is the same as the general equation of a circle, it's just written in a different form. Example Find the equation of the circle with centre \((2, - 3)\) and radius \(\sqrt 7\).

Save guides, add subjects and pick up where you left off with your BBC account. As a tangent is a straight line it is described by an equation in the form \(y - b = m(x - a)\). You need both a ...