Perpendicular from vertex to the opposite side of the triangle is the altitude of the triangle.

Here, AP ⊥ BC

So, AP is the altitude of ∆ABC

We also sometimes call altitude as height of triangle.

Similarly, we can draw altitude from point B.

Here, BQ ⊥ AC

So, BQ is the altitude of ∆ABC

Similarly, we can draw altitude from point C.

Here, CR ⊥ AB

So, CR is the altitude of ∆ABC

So, altitudes of ∆ABC can be,

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For an obtuse angled triangle ∆ABC
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Altitudes are

Now,

In a right angled triangle. ∆ABC

Altitudes are

So, right angled triangles has 3 altitudes in it

2 are it’s own arms