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none really i mean there is only 1 and it is a trapezoid. That's the only one.

You could add an isosceles triangle.

Any polygon where the side to the left of the bottom is the same as the side to the right of the bottom, and the next pair of sides are the same as one another (but different from the first pair), and so on. The angles would have to be selected so that the left half of the shape is the mirror image of the right half. So that is an infinite number added to the "only one".

A truncated parabola.

An ellipse.

and there are loads more.

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Any regular polygon has more than one line of symetry. Also the circle has an infinite amount of symetric lines.

Any shape really... square, rectangle, circle,

Isosceles triangle

Trapazoid

Q: What shapes have one line of symmetry?

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You would call the group of shapes which has at least one line of symmetry symmetrical shapes. Stars, circles, and rectangles are considered symmetrical shapes.

All regular shapes have a line of symmetry. But you can get rid of its line of symmetry by making it irregular (so the angles aren't the same).

It all depends what types of shapes, but take for example a circle, it can have multiple lines of symmetry.

Shapes do not always have lines of symmetry. For example, if you have an irregular shape, it will not have a line of symmetry. I am quite certain though that all geometric shapes have a line of symmetry.

No. Asymmetric shapes do not have any lines (or planes) of symmetry.

None. A line of symmetry, if it exists, is infinitely long and so a third of the line cannot exist as a separate entity.

A square dies because you can fold it across 😜.

An isosceles triangle and an isosceles trapezoid are two of them.

A square has 4 lines of symmetry

Yes, they do exist. In fact, there are infinitely many of them.

Trapezoid, isosceles triangle, arrow, kite, etc.

A nonrectangular parallelogram has rotational symmetry, but not line symmetry. Additionally, shapes such as the letters S, N, and Z can be rotated to show rotational symmetry, although they do not have line symmetry.