There are so many answers, it's not even funny.
Circle
Equilateral Triangle
Isosceles Triangle
Square
Rectangle
Rhombus
Parallelogram
Some Trapezoids
Perfect Pentagon
Perfect Hexagon
et cetera, et cetera.
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Try this:
Every right circular cone, conic section, and regular polygon
has at least one line of symmetry.
An isosceles triangle has one line of symmetry
a symmetrical shape
Every right circular cone, conic section, and regular polygon has at least one line of symmetry.
Trapezium
a pentagon
An isosceles triangle has one line of symmetry
the shape is a heart.
Circle, Square, Triangle
The letter D!
a Square.
Every right circular cone, conic section, and regular polygon has at least one line of symmetry.
Every right circular cone, conic section, and regular polygon has at least one line of symmetry.
Every right circular cone, conic section, and regular polygon has at least one line of symmetry.
a symmetrical shape
An isosceles triangle
The answer is a septahedron, 11 letter answer
sausage