1. A triangle has an angle that measures 105°. Where will the orthocenter be found?
This is a(n) obtuse triangle. So the orthocenter would be outside the triangle.
2. A triangle has an angle that measures 90°. Where will the orthocenter be found?
This is a(n) right triangle. So the orthocenter would be on the vertex of the right angle.
3. A triangle has angles that measure 30°, 65°, and 85°. Where will the orthocenter be found?
This is a(n) acute triangle. So the orthocenter would be inside the triangle.