Question

Draw a rough sketch of ∆ABC. Mark a point P in its interior and a point Q in its exterior. Does the point A lie in its exterior or interior? ​

Answer 1

We have to take three line segments and make a close figure.
So, the figure will be like:
Now, we mark P in the interior region of the sides and Q in the exterior of the triangle.

A lies on the boundary of the triangle. It is neither in the interior or the exterior of the triangle. So, it lies on the region of the triangle.