The Book of Lemmas Proposition 3 - Maple Help

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The Book of Lemmas: Proposition 3

 Main Concept 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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 position of D



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