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Elements of geometry : containing books I to VI and portions of books XI and XII of Euclid, with exercises and notes (1881)
Smith, J. Hamblin (James Hamblin), 1829-1901, Kirkland, Thomas, 1835-1898 · Toronto : W.J. Gage · leaf 196
AD, CD A, .: L BDA = L BCD. I. 32. But . BDA = I CBD ; I. a. .-. z BCD = L CBD, and .-. BD = CD. I. b. Cor. But BD = CA ;.-. CA = CD,and .-. z CD A = z CAD. I. a. Hence sum of z s CDA, CAD = twice z CAD, .: L BCD = twice z BAD. I. 32. But z ABD and z ^D5 are each = z ^O),.-, z J.^X> and z ADB… … Let ABCDE be the given 0.It is required to inscribe a regular jpentagon in the 0.Make an isosceles A FGH, having each of the z s at (r, j3double of z at i^. In © ABCDE inscribe raACD equiangular to a FGH, iv. 2.having zs at A, G, J)=thezs at F, G, H, respectively.Then z ^DC= twice z DAG, and z…Geometry · Geometry, Plane
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