Example What is the radius of the circle given by the equation x 2 + y 2 = 15 The value of r 2 = 15 so the radius of the circle is 15 = 3.872983346 This answer can be left as a surd to give an ...

GCSE Edexcel Other graphs - Edexcel The equation of a circle – Higher The most commonly occurring graphs are quadratic, cubic, reciprocal, exponential and circle graphs. Their equations can be ...