diameter   3 videos

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  Circumference

  Geometry Circles

  How to calculate the circumference of a circle.

  circumference pi distance radius diameter ratio
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  Arc Length

  Geometry Circles

  How to define arc length and how it is different from arc measure; how to calculate the length of an arc.

  arc length arc measure concentric circles fraction circumference radius diameter
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  Parts of a Circle

  Geometry Geometry Building Blocks

  How to define a circle and identify its main parts.

  center chord diameter radius congruent circles concentric circles arc minor arc major arc semicircle central angle