Because the circle's diameter has infinite lines of symmetry
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An order of symmetry is the number of times a line of symmetry can be drawn through a shape. For example, a square has four orders of symmetry: One up and down, one left and right, and two diagonal. A rectangle has an two orders of symmetry. A circle has an infinite number of orders of symmetry.
3- If an equilateral triangle has 3 equal sides, it also has 3 orders of rotational symmetry.
If it's a regular 8 sided octagon then it rotational symmetry to the order of 8
A parallelogram.
It have 4 axis of symmetry . Two Perpendiculars and two Diagonals