can someone help me with this ill give 200 points for whoever can tell me what these countries are i need this asap like by tmrw so please anyone

Answeris associated with sunny,dry weather;

A. - canada and the u.s 

The circumcenter is  equidistant  from each vertex of the triangle. the circumcenter is at the  intersection  of the  perpendicular bisectors  of the triangle's sides. the circumcenter of a right triangle falls on the side opposite the right  angle. the incenter  of a triangle is always inside it.