Theorem: The line segment connecting the midpoints of two sides of a triangle is parallel to the third side and is congruent to one half of the third side. Proof: Consider the triangle ABC with the midpoint of AB labelled M. Now construct a line through M parallel to BC.
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Pythagorean theorum.
The midpoint of a triangle is the 3rd sides' size, divided by 2.
Yes, the median of a triangle is from a vertex to the midpoint of the side opposite the vertex.
The answer depends on how the parallelogram in the triangle is constructed.
A triangle is not a segment joining a vertex and the midpoint of the side opposite the vertex.