Respuesta :

HomertheGenius
    If one of the exterior angles of a triangle is acute, then the related interior angle must be obtuse.
    Answer: The triangle must be C ) obtuse.

Answer:  Third option is correct.

Step-by-step explanation:

If one of the exterior angles of a triangle is acute then,

By using the rule of "Linear Pair" we can find the interior angle

Let the exterior angle be

[tex]80\textdegree[/tex]

So, its interior angle be

[tex]180-80=100\textdegree[/tex]

So, our triangle become obtuse triangle .

So, we can take any measure of acute angle , always we get an obtuse angle .

Hence, Third option is correct.