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Tangent Chord Theorem

How will you determine the measure of the angle formed by the tangent and a chord intersecting at the point of tangency?

To answer the question, click and drag any of the points B, C, or D and fill up the table for each trial. How will you determine the ?
VISIT MY YOUTUBE CHANNEL FOR SOME EXPLANATION. Tangent Chord Theorem https://www.youtube.com/watch?v=oFwD051U4VA