In a triangle TOP, its orthocentre lies at O. Then , the circumradius of `DeltaTOP` is ______

Let ABC be a triangle and O be its orthocentre .If R and R_(1) are the circum-radii of triangle ABC and AOB , then

Let ABC be a triangle and O be its orthocentre .If R and R_(1) are the circum-radii of triangle ABC and AOB , then

If PL, QM and RN are the altitudes of triangle PQR whose orthocentre is O, then Q is the orthocentre of the triangle

In a Delta ABC the equation of the side BC is 2x-y =3 and its circumcentre and orthocentre are (2,4) and (1,2) respectively . Circumradius of Delta ABC is

In a Delta ABC the equation of the side BC is 2x-y =3 and its circumcentre and orthocentre are (2,4) and (1,2) respectively . Circumradius of Delta ABC is

If two vertices of a triangle are (-2,3) and (5,-1) the orthocentre lies at the origin, and the centroid on the line x+y=7 , then the third vertex lies at

If two vertices of a triangle are (-2,3) and (5,-1) the orthocentre lies at the origin, and the centroid on the line x+y=7 , then the third vertex lies at