semicircle   2 videos

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  Angles in Semicircles and Chords to Tangents

  Geometry Circles

  How to prove that an angle inscribed in a semicircle is a right angle; how to solve for arcs and angles formed by a chord drawn to a point of tangency.

  inscribed angle semicircle tangent chord intercepted arc
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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