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Bar pantograph 6

OABC: parallelogram.

Triangles ADB and CBE are similar.

Triangles DAO, DBE and OCE are similar.

Triangles ODE and ABD are similar.

O: immobile

Figures traced by pen E and pen D are similar but figure D is turned an angle DAB in comparison with figure E.

Scale factor is k = AD/AB = CB/CE = constant.

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