[" 12.If in a "Delta ABC" ,incentre,circumcentre,and ortho- "],[" centre coincide each other,then "/_A+/_B=123" ."]

In a DeltaABC , incentre, circumcentre, and orthocentre coincide each other, then anglA+angleB= _________

A(0, 0), ,.B (-36, 15) and C(20, 15) are the verticies of Delta ABC . Find centroid, incentre, circum centre and ortho centre of Delta ABC .

In a triangle, if orthocentre, circumcentre, incentre and centroid coincide, then the triangle must be

In a triangle, if orthocentre, circumcentre, incentre and centroid coincide, then the triangle must be_____