[] , [] , [^]
, []Circumcenter / Special case (2)(GC World : Various Problems ,Five centroids of triangle etc.)
There are three triagnles (DBA, DBC, DCA) inside of a triagnle.
(1)Where should point D be to make one isosceles triangle?
(2)Where should point D be to make two isosceles triangles?
(3)Where should point D be to make three isosceles triangles?