The elements of Euclid for the use of schools and colleges : comprising the first two books and portions of the eleventh and twelfth books; with notes and exercises (1880)
Todhunter, I. (Isaac), 1820-1884 · Toronto : Copp, Clark · leaf 22
he base CF is equal to the base CG; [Definition 15.therefore the angle CHF is equal to the angle CHG ; [I. 8.and they are adjacent angles. But when a straight line, standing on another straight line,makes the adjacent angles equal to one another, each of tlieangles is called a right angle, and the… … ^18 EUCLIDS ELEMENTS, PROPOSITION 13. THEOREM, The angles which one straight line makes irith anotherstraight line on one side of it, either are two right angles,or are together equal to two right angles. Let the straight line AB make with the straight lineCD, on one side of it, the angles CBA,…
Geometry · Euclid's Elements · Mathematics, Greek
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