Let A B be a line segment and let C be the midpoint of A B- Extend A B to D such that B lies between A and D- Prove that A D-B D-2 C D-

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Constrcution of a Perpendicular to a Line from an External Point.

Let A B be a ...

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Let be a line segment and let C be the midpoint of. Extend to D such that B lies between A and D. Prove that AD + BD = 2CD.

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