All of the three sides of a triangle can be parts of parallel lines; it's just that no two of them can be parallel with each other. They can be parallel to some other line(s). In plane geometry parallel lines cannot form the sides of a common triangle.
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A triangle can have no parallel lines.
There are no parallel lines in a triangle.
None of the sides of any triangle are parallel. However, you can draw an infinite number of parallel lines inside any triangle.
None. A triangle (not even an equilateral one) has no parallel sides.
no,no triangle does