The elements of Euclid for the use of schools and colleges; comprising the first six books and portions of the eleventh and twelfth books; (1903)
Euclid, Todhunter, I. (Isaac), 1820-1884, ed. edt, Simson, Robert, 1687-1768, ed. edt · London; New York, Macmillan · leaf 206
arger circle.##8. BD J, ,, pentagon ,, smaller circle. 9. DF = BD.[zAFD = 2rt. z« -zACD =-zBCD = zABD, etc.] 10. BF is the side of a regular pentagon inscribed in the largercircle. [zFAD = zBAD; .-. zFAB = 2 zBAD^onefifth of fourrt. z«; /.etc.] 11. If AF meet BD in K, then CDKF is a… … Construction. Describe an isosceles triangle FGH, havingeach of the angles at G, H double of the angle at F; [IV. 10.in the circle ABODE inscribe the triangle AOD equiangularto the triangle FGH, [TV. 2. so that each of the angles AOD, ADO is double of theangle OAD;bisect the angles AOD, ADO by the…
Euclid's Elements · Geometry · Mathematics, Greek
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