doppler effect   2 videos

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  Reflections

  Geometry Transformations

  How to describe the effect of a reflection, how to describe the effect of the ordered pair rules (x,y) -> (-x, y),(x,y) -> (x, -y), (x,y) -> (y, x).

  transformation isometry orientation image equidistant ordered pair rules map x axis y axis line y = x
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  Chords and a Circle's Center

  Geometry Circles

  How to define a chord; how to describe the effect of a perpendicular bisector of a chord and the distance from the center of the circle.

  chord perpendicular bisector distance from the center congruent chords