What kind of triangle must have an altitude that is outside the triangle?

Brainliest?

'''For an obtuse-angled triangle, the altitude is outside the triangle. For such triangles, the base is extended and then a perpendicular is drawn from the opposite vertex to the base. For an obtuse triangle, the altitude is shown in the triangle below.'''

Obtuse

Step-by-step explanation:

When examining the shape of an obtuse triangle, due to it's wide nature, you will notice at least one of the side lengths will extend outward, which will create an altitude.

As outlined in this picture:

70

step-by-step explanation:

you can use a^2+ b^2=c^2