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,
For an obtuse angled triangle ∆ABC
In a right angled triangle. ∆ABC
So, right angled triangles has 3 altitudes in it
2 are it’s own arms