It varies depending on the angles and lines of the triangle.
one
An equilateral triangle has 3 lines of symmetry
1One
2
One
one
1
An equilateral triangle has 3 lines of symmetry
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.
An isosceles triangle has only 1 line of symmetry.
1One
3
None.
2
One
An isosceles triangle has 1 line of symmetry
If it is a 45° 45° 90° isosceles right triangle, then there are 2 sides that are perpendicular.