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Normally none unless it's in the shape of a rhombus which has 2 lines of symmetry.

Q: How man lines of symmetry does a parellelogram have?

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It have 4 axis of symmetry . Two Perpendiculars and two Diagonals

2 lines of symmetry

A nephroid has 2 lines of symmetry.

A parallelagram can be a square, which has four lines of symmetry or a rectangle which has two lines of symmetry but the generic parallelagram has zero lines of symmetry

A decagon need not have any lines of symmetry. It can also have 1 or 10 lines of symmetry.

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7

It have 4 axis of symmetry . Two Perpendiculars and two Diagonals

Triangle * * * * * The only triangle with rotational symmetry of order 3 is an equilateral triangle and that has 3 lines of symmetry, not 0. The triskelion (the three legs) on the Isle of Man flag has rotational symmetry of order 3 but no lines of symmetry.

2 lines of symmetry

it has five lines of symmetry

A nephroid has 2 lines of symmetry.

Equilateral Triangles (3 lines of symmetry)Rectangles (at least 2 lines of symmetry)Squares (4 lines of symmetry)Rhombuses (at least 2 lines of symmetry)Any regular polygon (at least 5 lines of symmetry)

it has no lines of symmetry

A parallelagram can be a square, which has four lines of symmetry or a rectangle which has two lines of symmetry but the generic parallelagram has zero lines of symmetry

There is no such thing as 8 lines of symmetry. A circle, for example, has infinitely many lines of symmetry.

A decagon need not have any lines of symmetry. It can also have 1 or 10 lines of symmetry.

5 lines