ABC is a triangle whose circumcentre, incentre and orthocentre are O, I and H respectively which lie inside the triangle, then :

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

If the centroid and orthocentre of a triangle are (3,3) and (-3,5) respectively then the circumcentre is

O,G,I and H are respectively the circumcentre, centroid, incentre and orthocentre of an equilateral triangle. Which of these points are identical ? / O, G, I तथा H क्रमशः एक समबाह त्रिभुज के परिकेंद्र, केंद्रक, अंतःकेंद्र और लम्बकेंद्र हैं | निम्न में से कौन से बिंदु समसरूप हैं ?