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Ending the fourteenth chapter of Planimetry is the following construction:

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Why is this a construction, when the quadrilateral in question is already given.

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The quadrilateral is not given. Given are only the lengths of its sides and the length of $EF$.

Now you have to reassemble this quadrilateral. You can imagine as some sticks which are appart of each other and you have to get them together.

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  • $\begingroup$ Ah, yes. Thank you. The part that threw me was at AE = EB without proof. I didn't get it until I physically moved two things together. $\endgroup$ – omgno Mar 23 at 6:44

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