Question

The altitude of an triangle will lie outside the triangle.

• A. acute-angled
• B. obtuse-angled
• C. right-angled

Answer 1

The correct option is B obtuse-angled

Altitude of a triangle is the perpendicular drawn from the vertex of the triangle to the opposite side. The altitude makes a right angle triangle with the base.
The altitude of the triangle depends on the angles opposite to the choosen vertex of the triangle.
If one of the angle opposite to the chosen vertex is obtuse, then altitude will lie outside the triangle as shown in the figure.