Chord+Lengths+&+Related+Thms+-+Katie+Margoth+&+Rosie

Katie Wilhelmus http://www.mathwarehouse.com/geometry/circle/product-segments-chords.php This website gives you theorems and practice problems

Margoth Mackey http://www.mathsrevision.net/gcse/pages.php?page=13 This website offers in depth explanations about thms and circles

Rosie Hutchison SparkNotes gives definitions and examples of theorems related to chords regarding intersecting chords, congruent chords, parallel chords, etc. __http://www.sparknotes.com/math/geometry2/theorems/section5.rhtml__