The Book of Lemmas: Proposition 3
Main Concept
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Let D be any point on a segment of a circle whose base is AB and let DE be perpendicular to AB. Take C on AB so that AE = EC. If now DF is an arc equal to the arc AD, and BF is joined, then BF, BC shall be equal.
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Adjust the slider, or click and drag on the plot to change the value of D.
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D =
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