In triangle ABC, the line joining the circumcenter and incenter is parallel to side BC, then `cosA+cosC` is equal to `-1` (b) `1` (c) `-2` (d) `2`

In triangle ABC, the line joining the circumcenter and incenter is parallel to side AC, then cos A + cos C is equal to

In a triangle ABC , the line joining the circumcentre and incentre is parallel to BC, then Cos B + Cos C is equal to:

In triangle ABC, line joining the circumcenter and orthocenter is parallel to side AC, then the value of tan A tan C is equal to

In triangle ABC if the line joining incenter to the circumcenter is parallel to the base BC, then the value of (cosB + cosC-1) is equal to

Let ABC be a triangle in which the line joining the circumecentre and incentre is parallel to base BC of the triangle. Then answer the following questions : If angleA=60^(@) , then Delta ABC is

Prove that the distance between the circumcenter and the incenter of triangle ABC is sqrt(R^2-2R r)

In a scalene acute Delta ABC, it is known that line joining circumentre and prthocentre is parallel to BC. Prove that the angle A in ((pi)/(3), (pi)/(2)).

If the line joining the incentre to the centroid of a triangle ABC is parallel to the side BC. Which of the following are correct ?

cosA+cosB+cosC is equal to (A) r/R (B) R/r (C) 1 (D) 1+r/R

In Delta ABC if the orthocentre is (1,2) and the circumcenter is (0,0) then centroid of Delta ABC is.