The shape that has three lines of symmetry is the equilateral triangle. It also has three angles of equal size and three sides of equal length.
A kite or arrowhead.
An equallateral triangle ~ID1533681184 Sorry ID1533681184 but and equallateral triangle does not have three lines of SYMMETRY, it has three line segments. ~EEE2
A shape with opposite sides parallel and of the same length and four right angles is a rectangle.
Bilateral Symmetry and 3 sides: a non-right isosceles triangle Bilateral Symmetry and 4 sides: a trapezoid (UK trapezium)
Yes. Think of a kite shape. Symmetry along its length but no parallel sides.