Mathematics for IGCSE & O level - Symmetry (Section 1 - No. 8)
An isosceles triangle has:
No lines of symmetry and no rotational symmetry
One line of symmetry and no rotational symmetry
No lines of symmetry and rotational symmetry of order 2
One line of symmetry and rotational symmetry of order 2
Explication
An isosceles triangle has one line of symmetry and no rotational symmetry.