It has 1 line of symmetry
1One
one
One
It has 1 vertical line of symmetry
An isosceles triangle has 1 line of symmetry
An isosceles triangle has only 1 line of symmetry.
an isosceles has only 1 line of symmetry
It has one line of symmetry
It has 1 line of symmetry
1One
one
One
It has 1 line of symmetry
It has 1 vertical line of symmetry
It has 1 vertical line of symmetry
A trapezoid has no lines of symmetry unless it is in the form of an isosceles trapezoid which has one line of symmetry