# The elements of Euclid: with dissertations intended to assist and encourage a critical examination of these elements as the most effectual means of establishing a juster taste upon mathematical subjects than that which at present prevails, Фьмпт 1

Printed at the Clarendon Press, 1781

### Фй лЭне пй чсЮуфет -Уэнфбоз ксйфйкЮт

Ден енфпрЯубме ксйфйкЭт уфйт ухнЮиейт фпрпиеуЯет.

### Ресйечьменб

 Еньфзфб 1 1 Еньфзфб 2 21 Еньфзфб 3 57 Еньфзфб 4 81 Еньфзфб 5 89 Еньфзфб 6 1 Еньфзфб 7 5 Еньфзфб 8 47
 Еньфзфб 9 65 Еньфзфб 10 103 Еньфзфб 11 121 Еньфзфб 12 124 Еньфзфб 13 1 Еньфзфб 14 25 Еньфзфб 15 66

### ДзмпцйлЮ брпурЬумбфб

УелЯдб 3 - Let it be granted that a straight line may be drawn from any one point to any other point.
УелЯдб 47 - If there be two straight lines, one of which is divided into any number of parts, the rectangle contained by the two straight lines is equal to the rectangles contained by the undivided line, and the several parts of the divided line. Let...
УелЯдб 68 - If a straight line drawn through the centre of a circle bisect a straight line in it which does not pass through the centre, it shall cut it at right angles : and if it cut it at right angles, it shall bisect it.
УелЯдб 45 - ABG ; (vi. 1.) therefore the triangle ABC has to the triangle ABG the duplicate ratio of that which BC has to EF: but the triangle ABG is equal to the triangle DEF; therefore also the triangle ABC has to the triangle DEF the duplicate ratio of that which BC has to EF. Therefore similar triangles, &c.
УелЯдб 15 - When a straight line set up on a straight line makes the adjacent angles equal to one another, each of the equal angles is right, and the straight line standing on the other is called a perpendicular to that on which it stands.
УелЯдб 86 - When you have proved that the three angles of every triangle are equal to two right angles...
УелЯдб 88 - EA : and because AD is equal to DC, and DE common to the triangles ADE, CDE, the two sides AD, DE are equal to the two CD, DE, each to each ; and the angle ADE is equal to the angle CDE, for each of them is a right angle ; therefore the base AE is equal (4.
УелЯдб 42 - If four straight lines be proportionals, the rectangle contained by the extremes is equal to the rectangle contained by the means ; And if the rectangle contained by the extremes be equal to the rectangle contained by the means, the four straight lines are proportionals. Let the four straight lines, AB, CD, E, F, be proportionals, viz.
УелЯдб 109 - Draw two diameters AC, BD of the circle ABCD, at right angles to one another; and through the points A, B. C, D, draw (17.
УелЯдб 8 - GB is equal to E, and CK to F ; therefore AB is the same multiple of E, that KH is of F: But AB...