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A cycloid is traced by a point on a circle rolling

  • A.outside another circle
  • B.inside another circle
  • C.about a fixed point at its centre
  • D.along a straight line

Answer: D

Correct answer: along a straight line

A cycloid is the path of a point on the rim of a circle rolling without slipping along a straight line. Rolling outside another circle gives an epicycloid and inside one a hypocycloid, so the three form a family distinguished only by what the circle rolls along.

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