The elements of geometry, in eight books; or, First step in applied logic1874 |
From inside the book
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Page xiii
... problems to be solved and discussed , by means of the theorems and corollaries previously read . And last , not least , he should assist the students in finding out the whole of the inverses and converses of each proposition , and prove ...
... problems to be solved and discussed , by means of the theorems and corollaries previously read . And last , not least , he should assist the students in finding out the whole of the inverses and converses of each proposition , and prove ...
Page xiv
... problem - solving can be raised in character above what has been termed ' exalted conundrum guess- ing , ' and acquire its full educational value . " The author takes this opportunity to acknowledge the great help he has derived from ...
... problem - solving can be raised in character above what has been termed ' exalted conundrum guess- ing , ' and acquire its full educational value . " The author takes this opportunity to acknowledge the great help he has derived from ...
Page xvii
... I. On Circumferences generally II . On Tangents • III . On Tangent Circumferences IV . On Common Tangents PROBLEMS PAGE 1 9 14 15 21 33 34 35 335 36 43 54 67 76 90 98 106 118 a BOOK II . ON ANGLES AND PROPORTIONAL LINES . CHAPTER.
... I. On Circumferences generally II . On Tangents • III . On Tangent Circumferences IV . On Common Tangents PROBLEMS PAGE 1 9 14 15 21 33 34 35 335 36 43 54 67 76 90 98 106 118 a BOOK II . ON ANGLES AND PROPORTIONAL LINES . CHAPTER.
Page xviii
... PROBLEMS BOOK III . ON PLANE FIGURES . CHAPTER I. ON RECTILINEAR PLANE FIGURES . SECTION I. On Polygons generally II ... PROBLEMS V. On Inscribed Plane Figures 173 183 192 201 205 217 • 235 244 256 267 279 . 284 296 306 BOOK IV . ON ...
... PROBLEMS BOOK III . ON PLANE FIGURES . CHAPTER I. ON RECTILINEAR PLANE FIGURES . SECTION I. On Polygons generally II ... PROBLEMS V. On Inscribed Plane Figures 173 183 192 201 205 217 • 235 244 256 267 279 . 284 296 306 BOOK IV . ON ...
Page xix
... PROBLEMS I. THEOREMS II . PROBLEMS GENERAL EXERCISES . PAGE • 317 324 335 346 361 . 371 381 388 SIGNS AND ABBREVIATIONS . FOR Which W. T. B. D. CONTENTS . xix.
... PROBLEMS I. THEOREMS II . PROBLEMS GENERAL EXERCISES . PAGE • 317 324 335 346 361 . 371 381 388 SIGNS AND ABBREVIATIONS . FOR Which W. T. B. D. CONTENTS . xix.
Common terms and phrases
A B and C D A B C and D E F adjacent angles adjacent sides altitude angle A B C angle ABC angles formed apothem bisect bisectrix centre angle centre line chord circular segment coincide Const Conversely COROLLARY II diagonals diameter divided equal angles equal circumferences equal to half equally distant equilateral equilateral polygon equivalent Eucl extremities given straight line greater homologous hypothenuse inscribed angle intercepts intersection isosceles trapezium isosceles triangle Let A B C magnitude middle line middle perpendicular middle point parallel parallelogram perimeter plane figure point H point of tangence points of section portions produced quadrangle quantities radii radius reasoning would prove rectangle regular polygon right-angled triangle Scholium segment sides A B square straight angle symmetric points tangent THEOREM transversal trapezium triangle A B C unequal vertex W. W. T. B. D. COROLLARY W. W. T. B. D. Inversely
Popular passages
Page 226 - If two triangles have two angles of the one equal to two angles of the other, each to each, and also one side of the one equal to the corresponding side of the other, the triangles are congruent.
Page 202 - Therefore all the interior angles of the figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Page 230 - If two triangles have one angle of the one equal to one angle of the other and the sides about these equal angles proportional, the triangles are similar.
Page 143 - 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. 11. An obtuse angle is that which is greater than a right angle. 12. An acute angle is that which is less than a right angle. 13. A term or boundary is the extremity of any thing.
Page 218 - If two triangles have the three sides of the one equal to the three sides of the other, each to each, the triangles are congruent.
Page 202 - The measure of an exterior angle of a triangle is equal to the sum of the measures of the two remote interior angles.
Page 268 - The perimeters of two regular polygons of the same number of sides, are to each other as their homologous sides, and their areas are to each other as the squares of those sides (Prop.
Page 43 - The projection of a point on a plane is the foot of the perpendicular drawn from the point to the plane.
Page 335 - Assuming that the areas of two triangles which have an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles...
Page 382 - FLC, there -are two angles -of the one equal to two angles of the other, each to each ; and the side FC which is adjacent to the equal...