The answer depends on what the line is.
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No. A triangle contains three line segments.
An Isosceles triangle has at least one line of symmetry but if it has more than one line of symmetry it can be an Equilateral triangle as well as a Isosceles Triangle. So a triangle with one line of symmetry is always Isosceles and If it has more than one it is always an Equilateral triangle as well as an Isosceles triangle. Example of an Isosceles triangle:
An isosceles triangle has 1 line of symmetry
An isoceles triangle
A relevant notion triangle is a triangle where side a is the longest line of a the triangle, the side b is the second longest line from the top of the triangle down to the right side of the triangle. The last line is side c which is the shortest line from the top to the bottom left.