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 xxi
... wholly unintelligible , unless the other be not only understood but remembered . The first direction therefore that the reader should observe is : to read every paragraph until he understands it fully , and to repeat it until he ...
... wholly unintelligible , unless the other be not only understood but remembered . The first direction therefore that the reader should observe is : to read every paragraph until he understands it fully , and to repeat it until he ...
Σελίδα xxix
... wholly within , and those parts of it not between the points lie wholly without the circle , 44 . ART . 55. In a circle , a perpendicular to a diameter , at its extremity , meets the circle in but one point , ibid . ART . 56. If a right ...
... wholly within , and those parts of it not between the points lie wholly without the circle , 44 . ART . 55. In a circle , a perpendicular to a diameter , at its extremity , meets the circle in but one point , ibid . ART . 56. If a right ...
Σελίδα xxx
... wholly within and the other wholly without the latter circle , ibid . ART . 79. If two circles having their centres at the two extremities of a given finite right line pass through the same point on that finite line , they meet in that ...
... wholly within and the other wholly without the latter circle , ibid . ART . 79. If two circles having their centres at the two extremities of a given finite right line pass through the same point on that finite line , they meet in that ...
Σελίδα 35
... wholly in that superficies . " To which it may be objected , that , in the first place , this is not a definition , but a theorem ( if properly expressed ) : and in the second place , that in a plane surface like that in the annexed ...
... wholly in that superficies . " To which it may be objected , that , in the first place , this is not a definition , but a theorem ( if properly expressed ) : and in the second place , that in a plane surface like that in the annexed ...
Σελίδα 38
... wholly on self - evident principles , is the greatest imperfection next to a false assumption . The system brought forward in our Treatise , it is believed , assumes no principle but what is immediately self - evident to the most ...
... wholly on self - evident principles , is the greatest imperfection next to a false assumption . The system brought forward in our Treatise , it is believed , assumes no principle but what is immediately self - evident to the most ...
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.