//! We want to create a circle tangent to an EnclosedCurv C1
//! with a tolerance Tolerance.
//! If we did not used Tolerance it is impossible to
-//! find a solution in the the following case : Pcenter is
+//! find a solution in the following case : Pcenter is
//! outside C1.
//! With Tolerance we will give a solution if the distance
//! between C1 and Pcenter is lower than or equal Tolerance/2.