If the vertices of a triangle are and (2, 1), then the orthocentre of the triangle is 

a) 
b) 
(0, 0) 

c) 
d) 
None of these 
If the vertices of a triangle are and (2, 1), then the orthocentre of the triangle is 

a) 
b) 
(0, 0) 

c) 
d) 
None of these 
(c)
The circumcentre of the triangle is (0, 0) as all the vertices lie on the circle . So the orthocenter will be (sum of coordinates, sum of coordinates)