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

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J.B. Lippincott, 1877 - Geometry - 368 pages
 

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Page 96 - If two polygons are composed of the same number of triangles, similar each to each and similarly placed, the polygons are similar.
Page 118 - The area of a rectangle is equal to the product of its base and altitude.
Page 189 - The lateral area of a prism is equal to the product of the perimeter of a right section of the prism by a lateral edge. Let AD...
Page 9 - The perpendicular is the shortest line that can be drawn from a point to a straight line.
Page 305 - Find the locus of a point such that the sum of the squares of its distances from two fixed points shall be equivalent to the square of the distance between the fixed points.
Page 187 - An oblique prism is one whose lateral edges are oblique to the planes of its bases.
Page 244 - The angle of two arcs of great circles is equal to the angle of their planes, and is measured by the arc of a great circle described from its vertex as a pole and included between its sides (produced if necessary).
Page 271 - A zone is a portion of the surface of a sphere included between two parallel planes.
Page 107 - The sum of the squares of the sides of any quadrilateral is equal to the sum of the squares of the diagonals plus four times the square of the line joining the middle points of the diagonals.
Page 253 - 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...

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