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
A Place Called Here never expecting to become missing herself as she discovers the world where everything which has ever been lost goes to, a place called Here. Jack goes on a search for Sandy believing that she is the key to finding his brother but learning more about her personal life than he should. Meanwhile, Sandy's possessions keeps getting lost from Here but found in this world. Something is bound to happen but the both of them have yet to know what it is. She was named Sandy because when she was born, her hair had the colour of sand. Although, they turned