T H E E L E M E N T S |
Book IV Proposition 11 | |
Let the isosceles triangle FGH be set out having each of the angles at G, H
double of the angle at F; [IV.10] let there be inscribed in the circle ABCDE the triangle ACD equiangular with the triangle FGH, so that the angle CAD is equal to the angle at F and the angles at G, H respectively equal to the angles ACD, CDA; [IV.2] therefore each of the angles ACD, CDA is also double of the angle CAD. Now let the angles ACD, CDA be bisected respectively by the straight lines CE, DB, [I.9] and let AB, BC, DE, EA be joined. |
||
Previous Page Return to Propositions Next Page |