Yes, the sides are lengths and those are positive. Even a degenerate triangle which is 3 collinear points joined by line segments has positive sides. (it's angles add up to 180 and its area is zero, by the way but the usual triangle lies in a unique plane while the degenerate one does not)
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No.
The side that is not adjacent to another side of a triangle is called the opposite side.
The side of the triangle next to the angle is called the adjacent side.
A midsegment of a triangle is parallel to the side of the triangle, and it's length is half the length of that side
It is a half left side triangle, nothing more, nothing less.