|Book IV Proposition 12|
Let A, B, C, D, E be conceived to be the angular points of the inscribed
pentagon, so that the circumferences AB, BC, CD, DE, EA are
through A, B, C, D, E
let GH, HK, KL, LM, MG be drawn touching the circle; [III.16, Por.]
let the center F of the circle ABCDE be taken, [III.1]
let FB, FK, FC, FL, FD be joined.
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