Ans: C
The centroid of $\Delta ABC$ must lie inside $\Delta ABC$. The figure below shows the centroid of an obtuse-angled triangle.
The centroid of $\Delta ABC$ must lie inside $\Delta ABC$. The figure below shows the centroid of an obtuse-angled triangle.
The circumcentre of $\Delta ABC$ must lie outside $\Delta ABC$. The figure below shows the circumcentre of an obtuse-angled triangle.
The orthocentre of $\Delta ABC$ must lie outside $\Delta ABC$. The figure below shows the orthocentre of an obtuse-angled triangle.
