• circumference – the distance around a circle
  • center – a point inside a circle that is equidistant (equal distance) from each point on the circle
  • diameter – the distance across the circle through the center
  • radius – the distance from the center to any point on the circle
  • pi – the ratio of the circumference to the diameter

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circumference
center
diameter

radius
pi


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Lesson 21 Vocabulary
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