No. Parallel lines are lines that extend in the same direction. In a triangle the lines go in different directions.
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There are no parallel sides in a right angle triangle
None !
I am guessing you mean a right angled triangle. The hypotenuse is the longest side on a right angled triangle. So it is the side facing / parallel to the right angle.
it has only one line of symmetry.
A triangle has no parallel sides but in the form of a right angle triangle it has perpendicular lines that meet at right angles which is 90 degrees.