An isosceles triangle has one line of symmetry
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a symmetrical shape
Every right circular cone, conic section, and regular polygon has at least one line of symmetry.
Trapezium
a 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.