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 σελίδες |
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Σελίδα v
... things than it now dares contemplate even in imagination . This we can speak of as yet but darkly ; the reader may be assured , however , that if he , with the moderate exertion of patience and in- dustry which we require , is content ...
... things than it now dares contemplate even in imagination . This we can speak of as yet but darkly ; the reader may be assured , however , that if he , with the moderate exertion of patience and in- dustry which we require , is content ...
Σελίδα ix
... things can be acquired , in which we are now generally deficient . A popular work upon almost every science has appeared : it is the design of the present to furnish a System of Geo- metry in like manner adapted for public use . There ...
... things can be acquired , in which we are now generally deficient . A popular work upon almost every science has appeared : it is the design of the present to furnish a System of Geo- metry in like manner adapted for public use . There ...
Σελίδα xii
... things which were abstract ; and we have simplified many doctrines which were perplexed . The next step should be to render the demonstrations of propositions as plain for the mind , and as brief for the memory , as possible . For this ...
... things which were abstract ; and we have simplified many doctrines which were perplexed . The next step should be to render the demonstrations of propositions as plain for the mind , and as brief for the memory , as possible . For this ...
Σελίδα xiii
... thing should be supposed done , and that it is not requisite to do it actually . But , independent of the practical use of Problems , their exclusion from theory is dangerous , if not disallowable , for this reason : That we might , in ...
... thing should be supposed done , and that it is not requisite to do it actually . But , independent of the practical use of Problems , their exclusion from theory is dangerous , if not disallowable , for this reason : That we might , in ...
Σελίδα xvi
... thing human is imperfect . We should endeavour to fortify the Elements of Euclid where it is vulnerable , and to rectify it where it is out of rule , without dwelling on its faults , beyond what is proper and just , for the sake of ...
... thing human is imperfect . We should endeavour to fortify the Elements of Euclid where it is vulnerable , and to rectify it where it is out of rule , without dwelling on its faults , beyond what is proper and just , for the sake of ...
Συχνά εμφανιζόμενοι όροι και φράσεις
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
Δημοφιλή αποσπάσματα
Σελίδα 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.
Σελίδα 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.
Σελίδα 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.
Σελίδα 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.
Σελίδα 30 - If two triangles have two angles of the one equal respectively to two angles of the other, the third angles are equal.
Σελίδα 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.
Σελίδα 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.
Σελίδα 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...
Σελίδα 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.
Σελίδα 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.