None !
how many sets of parallel lines are in a triangle
3 lines * * * * * None if it is acute angled scalene One if it is acute angled isosceles and Three if it is equilateral.
An isosceles triangle has no parallel sides but it does have 2 sides of equal lengths
one.
None !
A right angle triangle has no parallel sides
There are 0 parallel lines that a triangle has.
how many sets of parallel lines are in a triangle
A triangle can have no parallel lines.
There can be only one pair of perpendicular lines in an isosceles triangle when it is a right angled isosceles triangle. A non right angled isosceles triangle has no pairs of perpendicular lines.
3 lines * * * * * None if it is acute angled scalene One if it is acute angled isosceles and Three if it is equilateral.
There are no parallel lines in a triangle !
Infinite
Two.
There cannot be parallel lines in any [plane] triangles.
3