Question

Which of the following triangles have their one side as an altitude?

• A. Equilateral triangle
• B. Acute angled triangle
• C. Right angled triangle
• D. Obtuse angled triangle

Answer 1

The correct option is C Right angled triangle


Suppose,
$\Delta ABC$ is a right angled triangle.
We can see that two sides $BC$ and $AC$ are perpendicular to each other.

An altitude is a perpendicular line drawn from the vertex to the opposite side of the triangle.

$\therefore$ Here, side BC is also an altitude from B to the side AC and also side AC is an altitude from A to side BC.