Never, there are no true "opposite sides" on a triangle as each side intersects the other two at a point. Were two of the lines parallel, the triangle would be missing a point and would not be a closed shape.
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If you mean "triangle", a triangle can never have two parallel sides.If you mean "triangle", a triangle can never have two parallel sides.If you mean "triangle", a triangle can never have two parallel sides.If you mean "triangle", a triangle can never have two parallel sides.
No, a triangle will never have parallel sides.
triangle
It is impossible for a triangle to have any parallel sides. ■
An isosceles triangle has no parallel sides but it does have two equal sides