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An artist makes a circular mandala by repeating one motif around the centre. She uses 18 copies of the motif equally spaced.
What is the smallest angle of rotation (in degrees) that maps the mandala onto itself?

Class 7Rotational SymmetryGeometry
  • A40
  • B18
  • C22
  • D20

Step-by-Step Solution

With 18 equally spaced motifs the order is 18, so smallest angle = 360°/18 = 20°.
Answer: D) 20

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