Four, if the quadrilateral is a square, but if it is a rectangle it only has two and if it is an irregular quadrilateral it most probably only has one. So a rectangle, a rhombus, and a parallelogram have two, orders of rotational symetry but a kite and a trapezium although quadrilaterals (4sides) only have one.
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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
triangles have 0 rotational symmetry
it has 5 rotational symmetry
It has 1 order of rotational symmetry.