Elements of Geometry: Containing the First Six Books of Euclid, with a Supplement on the Quadrature of the Circle, and the Geometry of Solids: to which are Added, Elements of Plane and Spherical TrigonometryCollins and Hannay, 1833 - 333 σελίδες |
Αναζήτηση στο βιβλίο
Αποτελέσματα 1 - 5 από τα 43.
Σελίδα vi
... thing new in Ele- mentary Geometry would have been soon attempted . But his design was different ; it was his object to restore the writings of EUCLID to their original perfection , and to give them to Modern Europe as nearly as ...
... thing new in Ele- mentary Geometry would have been soon attempted . But his design was different ; it was his object to restore the writings of EUCLID to their original perfection , and to give them to Modern Europe as nearly as ...
Σελίδα viii
... thing from the rigour of geometrical demonstration . By this means , the steps of the reasoning which were before far separated , are brought near to one another , and the force of the whole is so clearly and directly perceived , that I ...
... thing from the rigour of geometrical demonstration . By this means , the steps of the reasoning which were before far separated , are brought near to one another , and the force of the whole is so clearly and directly perceived , that I ...
Σελίδα xi
... thing to be supposed , unless the thing itself be actually exhibit- ed . But it is not always necessary to make use of this defence ; for the existence of many things is obviously possible , and very far from implying a contradiction ...
... thing to be supposed , unless the thing itself be actually exhibit- ed . But it is not always necessary to make use of this defence ; for the existence of many things is obviously possible , and very far from implying a contradiction ...
Σελίδα xii
... things has thrown in its way . It is a rule , too , which cannot always be followed , and from which even EUCLID himself has been forced to depart in more than one in- stance . In the Book , therefore , on the Properties of Solids ...
... things has thrown in its way . It is a rule , too , which cannot always be followed , and from which even EUCLID himself has been forced to depart in more than one in- stance . In the Book , therefore , on the Properties of Solids ...
Σελίδα xiii
... thing not essential . That it may be the better under- stood , and because the demonstrations which require ex- haustions are , no doubt , the most difficult in the Elements , they are all conducted as nearly as possible in the same way ...
... thing not essential . That it may be the better under- stood , and because the demonstrations which require ex- haustions are , no doubt , the most difficult in the Elements , they are all conducted as nearly as possible in the same way ...
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
ABC is equal ABCD altitude angle ABC angle ACB angle BAC angle EDF arch AC base BC bisected centre circle ABC circumference cosine cylinder demonstrated diameter draw equal angles equiangular equilateral equilateral polygon equimultiples Euclid exterior angle fore four right angles given straight line greater hypotenuse inscribed join less Let ABC Let the straight line BC magnitudes meet opposite angle parallel parallelogram perpendicular polygon prism PROB produced proportional proposition Q. E. D. COR Q. E. D. PROP radius ratio rectangle contained rectilineal figure remaining angle segment semicircle shewn side BC sine solid angle solid parallelopipeds spherical angle spherical triangle SPHERICAL TRIGONOMETRY straight line AC THEOR third touches the circle triangle ABC triangle DEF wherefore
Δημοφιλή αποσπάσματα
Σελίδα 49 - PROB. jf 0 a given straight line to apply a parallelogram, which shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle, Let AB be the given straight line, and C the given triangle, and D the given rectilineal angle.
Σελίδα 29 - The angles which one straight line makes with another upon one tide of it, are either two right angles, or are together equal to two right angles. Let the straight line AB make with CD, upon one side of it the angles CBA, ABD ; these are either two right angles, or are together equal to two right angles. For, if the angle CBA be equal to ABD, each of them is a right angle (Def.
Σελίδα 19 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.
Σελίδα 55 - If a straight line be divided into any two parts, the rectangle contained by the whole and one of the parts, is equal to the rectangle contained by the two parts, together with the square of the aforesaid part.
Σελίδα 90 - If from any point without a circle two straight lines be drawn, one of which cuts the circle, and the other touches it ; the rectangle contained by the whole line which cuts the circle, and the part of it without the circle, shall be equal to the square of the line which touches it.
Σελίδα 86 - The angle in a semicircle is a right angle; the angle in a segment greater than a semicircle is less than a right angle; and the angle in a segment less than a semicircle is greater than a right angle.
Σελίδα 87 - If a straight line touch a circle, and from the point of contact a straight line be drawn cutting the circle, the angles made by this line with the line touching the circle shall be equal to the angles which are in the alternate segments of the circle.
Σελίδα 43 - THE straight lines which join the extremities of two equal and parallel straight lines, towards the same parts, are also themselves equal and parallel.
Σελίδα 39 - Wherefore, if a straight line, &c. QED PROP. XXIX. THEOR. If a straight line fall upon two parallel straight lines, it makes the alter' male angles equal to one another ; and the exterior angle equal to the interior and opposite upon the same side ; and likewise the two interior angles upon the same. side together equal to two right angles.
Σελίδα 54 - 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. Let...