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Riya is designing a ceiling fan with identical blades equally spaced around the centre. She wants the fan to look exactly the same every time it turns through 90°.
How many blades should the fan have?

Class 7Rotational SymmetryGeometry
  • A8
  • B5
  • C4
  • D3

Step-by-Step Solution

Order = 360° / 90° = 4. So 4 equally spaced blades give a 90° angle of rotation.
Answer: C) 4

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