What is a quadrilateral that has one line of symmetry?

Answer 1

A square? :)

Answer 2

There is no quadrilateralthat has 1 line of symmetry as quadrilaterals have to have at least 1 line of symmetry.

Answer 3

A trapezoid is the only quadrilateral with one line of symmetry.

Answer 4

The parallelogram has no lines of symmetery

Answer 5

a quadrilateral that will never have any line of symmetry is a trapezium

<http://en.wikipedia.org/wiki/Trapezium#Confusing_terminology>