Elements of Geometry, Containing the First Six Books of EuclidBaldwin, Cradock, and Joy, 1826 - 180 σελίδες |
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Σελίδα ix
... circumference of the circle in measuring angles . There can be little doubt that he made many other discoveries , which have not been directly handed down to us , but which might have been inserted in elementary books , and ranked among ...
... circumference of the circle in measuring angles . There can be little doubt that he made many other discoveries , which have not been directly handed down to us , but which might have been inserted in elementary books , and ranked among ...
Σελίδα xvii
... circumference , and its altitude equal to the radius . Being unable to determine the exact quadra- ture of the circle , for want of the rectification of its circumference , which all the methods he devised would not effect , he ...
... circumference , and its altitude equal to the radius . Being unable to determine the exact quadra- ture of the circle , for want of the rectification of its circumference , which all the methods he devised would not effect , he ...
Σελίδα xviii
... circumference to its diameter must be between these two ratios . But that which has rendered him most famous in the eyes of posterity is the fabrication of such admirable engines for the defence of Syracuse when besieged by the Roman ...
... circumference to its diameter must be between these two ratios . But that which has rendered him most famous in the eyes of posterity is the fabrication of such admirable engines for the defence of Syracuse when besieged by the Roman ...
Σελίδα 2
... circumference of the circle , and divides the circle into two equal parts . 18. A semicircle is the figure contained by the diameter , and the part of the circumference cut off by the diameter . * 19. Rectilineal figures are those which ...
... circumference of the circle , and divides the circle into two equal parts . 18. A semicircle is the figure contained by the diameter , and the part of the circumference cut off by the diameter . * 19. Rectilineal figures are those which ...
Σελίδα 63
... circumference of the circle it cuts off . 7. The angle of a segment is that which is contained by a right line and the circumference of the circle . 8. The angle in a segment is , when some EUCLID'S ELEMENTS. ...
... circumference of the circle it cuts off . 7. The angle of a segment is that which is contained by a right line and the circumference of the circle . 8. The angle in a segment is , when some EUCLID'S ELEMENTS. ...
Άλλες εκδόσεις - Προβολή όλων
Elements of Geometry; Containing the First Six Books of Euclid ... Euclid,John Playfair Πλήρης προβολή - 1814 |
Συχνά εμφανιζόμενοι όροι και φράσεις
ABC is equal adjacent angles Algebra angle ABC angle ACB angle BAC angles equal base BC bisected centre circle ABC circum circumference BC diameter double draw equal angles equal circles equal right lines equal to F equi equiangular equimultiples Euclid EUCLID'S ELEMENTS exceed exterior angle fore four magnitudes fourth Geometry given circle given point given right line gnomon greater ratio hence inscribed join less Let ABC multiple parallel parallelogram perpendicular polygon proportional Q. E. D. Deduction Q. E. D. PROPOSITION rectangle contained remaining angle right angles right line AB right line AC sector HEF segment side BC similar and similarly square of AC subtending THEOREM tiple touches the circle triangle ABC triangle DEF whence whole
Δημοφιλή αποσπάσματα
Σελίδα xxvi - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference. XVIII. A semicircle is the figure contained by a diameter and the part of the circumference cut off by the diameter. XIX. "A segment of a circle is the figure contained by a straight line, and the circumference it cuts off.
Σελίδα 74 - The straight line drawn at right angles to the diameter of a circle, from the extremity of it, falls without the circle...
Σελίδα 33 - The complements of the parallelograms, which are about the diameter of any parallelogram, are equal to one another.
Σελίδα 148 - 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.
Σελίδα 27 - And because the angle ABC is equal to the angle BCD, and the angle CBD to the angle ACB, therefore the whole angle ABD is equal to the whole angle ACD • (ax.
Σελίδα 8 - To bisect a given finite straight line, that is, to divide it into two equal parts. Let AB be the given straight line : it is required to divide it intotwo equal parts.
Σελίδα 73 - DH; (I. def. 15.) therefore DH is greater than DG, the less than the greater, which is impossible : therefore no straight line can be drawn from the point A, between AE and the circumference, which does not cut the circle : or, which amounts to the same thing, however great an acute angle a straight line makes with the diameter at the point A, or however small an angle it makes with AE, the circumference must pass between that straight line and the perpendicular AE.
Σελίδα 99 - To describe a square about a given circle. Let ABCD be the given circle ; it is required to describe a square about it. . Draw two diameters AC, BD of the circle ABCD, at right angles to one another, and through the points A, B, • 17.3. C, D, draw...
Σελίδα 7 - ... equal to them, of the other. Let ABC, DEF be two triangles which have the two sides AB, AC equal to the two sides DE, DF, each to each, viz. AB equal to DE, and AC to DF ; but the base CB greater than the base EF ; the angle BAC is likewise greater than the angle EDF.
Σελίδα 88 - From a given circle to cut off a segment, which shall contain an angle equal to a given rectilineal angle.