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Intersecting Chords Theorem

Author:
teo lip seng, DavidA
Topic:
Angles, Geometry
Slide points A, B, C, D to illustrate the result. It is important to notice that lengths are always measured to the intersection of the chords regardless of whether this intersection is inside or outside the circle. Circle Theorems http://www.geogebratube.org/student/c89/m1462/yryy

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