Choose whether the given statement is true/false:

An altitude of a triangle always lies outside the triangle.

The above statement is False.

We know that the altitude of a triangle is the perpendicular drawn from the vertex of the triangle to the opposite side.

The altitude of the triangle depends on the angles opposite to the chosen vertex of the triangle.
If one of the angles opposite to the chosen vertex is obtuse, then altitude will lie outside the triangle as shown in the figure.