Question 1012927
If C is the right angle, AB is the hypotenuse.
The hypotenuse is the longest side of a right triangle.
If AC is longer than AB, C cannot be a right angle.
Moreover, if it is a right triangle (C=right angle),
the perpendicular bisector of BC will not meet AC,
it will meet AB.
Perhaps you should check your question. If you posted 
accurately, no answer is possible for your problem.