They have three connecting lines. The three interior angles add up to 180 degrees. The three exterior angles add up to 360 degrees.
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The characteristics of a triangle are as follows: -three sided polygon -all internal angles equal to 180 That's basically it my friend
The orthocenter of a triangle is the point where the altitudes of the triangle intersect. It may lie inside, outside, or on the triangle depending on the type of triangle. In an acute triangle, the orthocenter lies inside the triangle; in a right triangle, it is at the vertex opposite the right angle; and in an obtuse triangle, it is outside the triangle.
A three sided polygon in which two sides are equal in length and two angles are equal in size.
That is the definition of a triangle. If it did not have three sides it would not be a triangle. If it did not have three angles, it would not be a triangle.
A triangle with three sides is a polygon.