# A Treatise on Elementary Geometry: With Appendices Containing a Collection of Exercises for Students and an Introduction to Modern Geometry

J.B. Lippincott, 1872 - 368 СЕКъДЕР

### тИ КщМЕ ОИ ВЯчСТЕР -сЩМТАНГ ЙЯИТИЙчР

дЕМ ЕМТОПъСАЛЕ ЙЯИТИЙщР СТИР СУМчХЕИР ТОПОХЕСъЕР.

### пЕЯИЕВЭЛЕМА

 PLANE GEOMETRY 11 BOOK II 52 BOOK III 91 BOOK IV 126
 GEOMETRY OF SPACE 171 POLYEDRONS 196 THE CYLINDER 238 BOOK IX 271

### дГЛОЖИКч АПОСПэСЛАТА

сЕКъДА 128 - The area of a rectangle is equal to the product of its base and altitude.
сЕКъДА 348 - Three lines are in harmonical proportion, when the first is to the third, as the difference between the first and second, is to the difference between the second and third ; and the second is called a harmonic mean between the first and third. The expression 'harmonical proportion...
сЕКъДА 19 - The perpendicular is the shortest line that can be drawn from a point to a straight line.
сЕКъДА 79 - To draw a straight line through a given point parallel to a given straight line. Let A be the given point, and BC the given straight line ; it is required to draw a straight line through the point A, parallel to the straight hue BC.
сЕКъДА 29 - The sum of the three angles of any triangle is equal to two right angles.
сЕКъДА 175 - If a straight line is perpendicular to each of two straight lines at' their point of intersection, it is perpendicular to the plane of those lines.
сЕКъДА 263 - The sum of the angles of a spherical triangle is greater than two and less than six right angles ; that is, greater than 180╟ and less than 540╟. (gr). If A'B'C' is the polar triangle of ABC...
сЕКъДА 219 - A truncated triangular prism is equivalent to the sum of three pyramids, whose common base is the base of the prism and whose vertices are the three vertices of the inclined section.
сЕКъДА 197 - A right prism is a prism •whose lateral edges are perpendicular to the planes of the bases.
сЕКъДА 127 - Any two rectangles are to each other as the products of their bases by their altitudes. Let R and R...