square
a shape with a line of symmetry
square, septagon (heptagon)!
The 2D shape which has one line of symmetry is the trapezium.
An isosceles triangle has one line of symmetry
Not necessarily.
no
square
How about an isosceles triangle which has one line of symmetry
the shape is a heart.
An isosceles triangle and a kite have only one line of symmetry.
symmetrical
An isosceles triangle