A System of Popular Geometry: Containing in a Few Lessons So Much of the Elements of Euclid as is Necessary and Sufficient for a Right Understanding of Every Art and Science in Its Leading Truths and General PrinciplesTaylor and Walton, Booksellers to the University of London, 30 Upper Gower Street, 1836 - 128 páginas |
Dentro del libro
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Página xiv
... stands , is unintelligible to most readers , and unsatisfactory to all . Some change was absolutely necessary to be made in it , if we would adapt our treatise for general comprehension . So long as Euclid's * doctrine of parallels ...
... stands , is unintelligible to most readers , and unsatisfactory to all . Some change was absolutely necessary to be made in it , if we would adapt our treatise for general comprehension . So long as Euclid's * doctrine of parallels ...
Página xv
... stand in the very threshold of elementary mathematics , it will for ever repel common understandings , and for ever confine the study to those who have genius or perseverance much greater than ordinary . The philosopher or the professed ...
... stand in the very threshold of elementary mathematics , it will for ever repel common understandings , and for ever confine the study to those who have genius or perseverance much greater than ordinary . The philosopher or the professed ...
Página xxii
... stand the theory alone of geometry - to arrive at those geometrical truths , merely , which are necessary for the other Sciences - will confine themselves to this part . A short series of PROBLEMS , which comprise the prac- tical part ...
... stand the theory alone of geometry - to arrive at those geometrical truths , merely , which are necessary for the other Sciences - will confine themselves to this part . A short series of PROBLEMS , which comprise the prac- tical part ...
Página xxiii
... standing upon another , make the adjacent angles equal to one another , each of these angles is called a right angle , and the right line which stands upon the other is called a perpendicular to it , 12 . DEF . VII . An angle greater ...
... standing upon another , make the adjacent angles equal to one another , each of these angles is called a right angle , and the right line which stands upon the other is called a perpendicular to it , 12 . DEF . VII . An angle greater ...
Página xxx
... stand upon equal arches , 61 . ART . 85. In equal circles , the angles which stand upon equal arches are equal , whether they be at the centres or the circumferences , 62 . ART . 86. These latter four articles , it is evident , are true ...
... stand upon equal arches , 61 . ART . 85. In equal circles , the angles which stand upon equal arches are equal , whether they be at the centres or the circumferences , 62 . ART . 86. These latter four articles , it is evident , are true ...
Términos y frases comunes
ABCD altitudes angle ABC angle BAC angle CDA angles EAB angles equal base AC centre chord circumference Consequently contained definition demonstration equal arches equal bases equal circles equal sides equal to CD equal to four equal triangles equally distant equi-angular Euclid finite right line Geometry given finite right given point given right line greater Hence ibid internal angles Join KLMN Let ABC line CD lines be drawn magnitude NOTE opposite angles parallel right lines parallelogram perpendicular PROB produced propositions quantities reciprocally proportional rectangle rectilineal figure respectively equal right angles right line divided right line drawn right line intersect segments side AB side AC square of AB square of AC submultiple supposition is false tangent theorem third side three sides tiples triangle ABC unequal vertex
Pasajes populares
Página 31 - In any right-angled triangle, the square which is described on the side subtending the right angle is equal to the squares described on the sides which contain the right angle.
Página xxxi - 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.
Página 3 - If two triangles have two sides of the one equal, respectively, to two sides of the other, but the included angle of the first triangle greater than the included angle of the second, then the third side of the first is greater than the third side of the second.
Página xxx - If there be two straight lines, one of which is divided into any number of parts, the rectangle contained by the two straight lines is equal to the rectangles contained by the undivided line, and the several parts of the divided line.
Página 30 - If two triangles have two angles of the one equal respectively to two angles of the other, the third angles are equal.
Página 25 - If a parallelogram and a triangle be upon the same base, and between the same parallels; the parallelogram shall be double of the triangle.
Página 99 - If the square described on one of the sides of a triangle be equal to the squares described on the other two sides of it, the angle contained by these two sides is a right angle.
Página 51 - A rectilineal figure is said to be described about a circle, when each side of the circumscribed figure touches the circumference of the circle. 5. In like manner, a circle is said to be inscribed...
Página 10 - When a straight line standing on another straight line, makes the adjacent angles equal to one another, each of these angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it.
Página 11 - An angle less than a right angle is called an acute angle; an angle greater than a right angle and less than two right angles is called an obtuse angle.