### ‘ι κίμε οι ςώόστερ -”ΐμτανγ ξώιτιξόρ

Ρεμ εμτοπΏσαλε ξώιτιξίρ στιρ σθμόηειρ τοποηεσΏερ.

### –εώιεςϋλεμα

 General Principles 4 9 BOOK II 35 The Circle and the Measure of Angles 44 BOOK IV 57 BOOK V 83 Regular Polygons and the Area of the Circle 98 SOLID GEOMETRY 112
 Polyedrons 127 BOOK IX 148 BOOK X 166 CONIC SECTIONS 177 Ellipse 188 Hyperbola 205

### Ργλοωικό αποσπήσλατα

”εκΏδα 60 - Any two rectangles are to each other as the products of their bases by their altitudes.
”εκΏδα 17 - If two triangles have two sides, and the included angle of the one, equal to two sides and the included angle of the other, each to each, the two triangles will be equal, their third sides will be equal, and their other angles will be equal, each to each.
”εκΏδα 101 - When you have proved that the three angles of every triangle are equal to two right angles...
”εκΏδα 63 - IF a straight line be divided into any two parts, the square of the whole line is equal to the squares of the two parts, together with twice the' rectangle contained by the parts.
”εκΏδα 18 - BC common to the two triangles, which is adjacent to their equal angles ; therefore their other sides shall be equal, each to each, and the third angle of the one to the third angle of the other, (26.
”εκΏδα 10 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it.
”εκΏδα 32 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
”εκΏδα 37 - Proportional, when the ratio of the first to the second is equal to the ratio of the second to the third.
”εκΏδα 15 - Wherefore, when a straight line, &c. QED PROP. XIV. THEOR. If, at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line.
”εκΏδα 44 - A Circle is a plane figure bounded by a curved line every point of which is equally distant from a point within called the center.