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The order of symmetry will be 1 and the angle of rotational symmetry is 360 degrees.Equilateral Triangle: The equilateral triangle, we mean that the triangle is having all the three line segments of the same measure.
For example, if we have a Square and we have to rotate it 90 degrees, every time we get the same square. We can find this, 90 degrees by dividing 360 degrees by 4 because 4 sides are present in a square. And we can say that, the rotational symmetry of a square is at every 90 degrees. In a pentagon 5 sides are present so the rotational symmetry is 360 / 5 = 72 degrees. In a Hexagon 6 sides are present so the has rotational symmetry is 360 / 6 = 60 degrees. In a heptagon 7 sides are present so it has rotational symmetry as 360/7 = 51.4 degrees. In an octagon 8 sides are present and it has rotational symmetry as 360/8 = 45 degrees. This is all about rotational symmetry of different polygons.