The 2D shape which has one line of symmetry is the trapezium.
symmetrical
a shape with a line of symmetry
An isosceles triangle has one line of symmetry
square
How about an isosceles triangle which has one line of symmetry
Not necessarily.
no
An isosceles triangle and a kite have only one line of symmetry.
a triangle only has one line of symmetry
symmetrical
An isosceles triangle
A square
Every right circular cone, conic section, and regular polygon has at least one line of symmetry.