Three pairs. The line joining the midpoints of any two sides of a triangle is always parallel to the third side of the triangle (and half its length).
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if the triangle is a right angle it has 2 perpendicular line segments.
There is no specific name - other than what you used: "a pair of parallel line segments".
Line segments are lines so the answer is 3.
a triangle has 3 line segments u are
A geometric figure that has three line segments for sides is a triangle. Rectangles and squares are made of four line segments, while a circle is made out of a pair of arcs.