a circle.
A parallelogram
An irregular quadrilateral.
Septahedron
There is no such shape. A 2d shape with 5 sides and all equal angles must be a regular pentagon (or a 5-pointed star if you stretch the definition of "all angles"). And a regular pentagon - or star - has 5 lines of symmetry.
Regular polygon with any number of sides, circle, ellipse, isosceles triangle, rectangle, isosceles trapezium, kite, arrowhead.
A 2d shape with uncountable lines of symmetry is a circle.
The 2D shape which has one line of symmetry is the trapezium.
Octagon
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a circle.
A parallelogram
An isosceles triangle and a kite have only one line of symmetry.
a parallelogram, if it's 2d.
A square
Square