A triangle, an oval, a trapezoid as well I think.
The 2D shape which has one line of symmetry is the trapezium.
An isosceles triangle and a kite have only one line of symmetry.
Square
A square
Ss
Septahedron
septahedron
1
A 2d shape with uncountable lines of symmetry is a circle.
Octagon
Hdhdhd
A parallelogram