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An isosceles triangle has one line of symmetry
An irregular pentagon.
a Square.
The letter D!
An isosceles triangle has one line of symmetry
An isosceles triangle has 1 line of symmetry
An isosceles triangle has one line of symmetry
An isosceles triangle has one line of symmetry
Trapezium
a heart
the shape is a heart.
scalene triangle.
Isosceles triangle
a pentagon
polygon!
An irregular pentagon.
You cannot have one parallel line. There must be another line that it is parallel to. Also, 1 symmetry is meaningless - you can have one axis of symmetry or rotational symmetry of order one. The answer will depend on which one it is.