(0:01)Rotational Symmetry: A shape has rotational symmetry if it can be rotated less than 360Â° and still look the same.

(0:16)Centre of Rotation: The fixed point around which a shape rotates. For most regular polygons, the centre of rotation is the geometric centre of the shape.

(0:28) Angle of Rotation Formula: Found by dividing 360Â° by the order of symmetry. E.g., a square has an angle of rotation of 90Â° (360Â° Ã· 4).

(0:42) Order of Symmetry: The order of symmetry is the number of times a shape aligns with itself during a 360Â° rotation. For instance, an equilateral triangle has an order of symmetry of 3.

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