# Introduction and books 1,2

The University Press, 1908
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### Ресйечьменб

 INTRODUCTION 1 29 7 99 17
 BOOK 413 Book II 420

### ДзмпцйлЮ брпурЬумбфб

УелЯдб 322 - AB be the given straight line ; it is required to divide it into two parts, so that the rectangle contained by the whole, and one of the parts, shall be equal to the square of the other part.
УелЯдб 204 - After remarking that the mathematician positively knows that the sum of the three angles of a triangle is equal to two right angles...
УелЯдб 259 - If two triangles have two sides of the one equal to two sides of the...
УелЯдб 188 - That, if a straight line falling on two straight lines make the interior angles on the same side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on which are the angles less than the two right angles.
УелЯдб 204 - In any triangle, the sum of the three angles is equal to two right angles, or 180°.
УелЯдб 162 - A plane angle is the inclination to one another of two lines in a plane which meet one another and do not lie in a straight line.
УелЯдб 167 - 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 257 - Through a given point to draw a straight line parallel to a given straight line, Let A be the given point, and BC the given straight line : it is required to draw through the point A a straight line parallel to BC.
УелЯдб 176 - Parallel straight lines are straight lines which, being in the same plane and being produced indefinitely in both directions, do not meet one another in either direction.
УелЯдб 235 - Upon the same base, and on the same side of it, there cannot be two triangles that have their sides which are terminated in one extremity of' the base, equal to one another, and likewise those which are terminated in the other extremity.