Euclid's Elements: Or, Second Lessons in Geometry,in the Order of Simson's and Playfair's Editions ...Collins, Brother & Company, 1846 - 138 σελίδες |
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Αποτελέσματα 1 - 5 από τα 51.
Σελίδα 7
... A finite line is that of which the extreme points are given . Note . There are two classes of lines ; namely , straight and curved : of curves there are several species ; but the circle alone will be here con- sidered . Lines have ...
... A finite line is that of which the extreme points are given . Note . There are two classes of lines ; namely , straight and curved : of curves there are several species ; but the circle alone will be here con- sidered . Lines have ...
Σελίδα 11
... a given straight line ( AB ) . Construction . From the extreme points , A and B , with the radius AB , describe the circles ACE , BCD ( a ) , intersecting each other in the point C : join C to A and B ( b ) . Demonstration . ABC is the ...
... a given straight line ( AB ) . Construction . From the extreme points , A and B , with the radius AB , describe the circles ACE , BCD ( a ) , intersecting each other in the point C : join C to A and B ( b ) . Demonstration . ABC is the ...
Σελίδα 12
... given straight lines , to cut off a part equal to the less ( C ) . Constr . Draw the line AD equal to C , ( a ) ; and from the centre A , with the distance AD , describe the circle DEF ( b ) . Dem . AD and AE are equal radii ( c ) ; but ...
... given straight lines , to cut off a part equal to the less ( C ) . Constr . Draw the line AD equal to C , ( a ) ; and from the centre A , with the distance AD , describe the circle DEF ( b ) . Dem . AD and AE are equal radii ( c ) ; but ...
Σελίδα 15
... given rectilineal angle ( BAC ) ; that is , to divide it into two equal angles . Constr . In AB take any point D ; make AE equal to AD ( a ) ; join DE ( ¿ ) , and upon it de- scribe an equilateral triangle DEF ( c ) ; join AF : the straight ...
... given rectilineal angle ( BAC ) ; that is , to divide it into two equal angles . Constr . In AB take any point D ; make AE equal to AD ( a ) ; join DE ( ¿ ) , and upon it de- scribe an equilateral triangle DEF ( c ) ; join AF : the straight ...
Σελίδα 16
... straight lines . Draw BE at right angles to AB ( a ) then if ABC be a straight line , EBC is a right angle ; and if ... given straight line ( AB ) , of sufficient length , from a given point ( C ) on one side of it . Construction . Take ...
... straight lines . Draw BE at right angles to AB ( a ) then if ABC be a straight line , EBC is a right angle ; and if ... given straight line ( AB ) , of sufficient length , from a given point ( C ) on one side of it . Construction . Take ...
Άλλες εκδόσεις - Προβολή όλων
Euclid's Elements, Or Second Lessons in Geometry, in the Order of Simson's ... D. M'Curdy Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2017 |
Euclid's Elements, Or Second Lessons in Geometry, in the Order of Simson's ... D. M'Curdy Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2017 |
Συχνά εμφανιζόμενοι όροι και φράσεις
ABCD alternate angles angle ACD angles ABC angles equal antecedents Argument base BC bisected centre Chart chord circle ABC circumference Constr Denison Olmsted diameter draw drawn equal angles equal arcs equal radii equal sides equals the squares equi equiangular equilateral equilateral polygon equimultiples exterior angle fore Geometry given circle given rectilineal given straight line gles gnomon greater half inscribed isosceles isosceles triangle join less meet multiple opposite angles parallelogram parallelopipeds pentagon perimeter perpendicular plane polygon produced Q. E. D. Recite radius ratio rectangle rectangle contained rectilineal figure School segment semicircle similar similar triangles sine square of AC tangent touches the circle triangle ABC unequal Wherefore
Δημοφιλή αποσπάσματα
Σελίδα 90 - If two triangles have one angle of the one equal to one angle of the other, and the sides about the equal angles proportionals, the triangles shall be equiangular, and shall have those angles equal which are opposite to the homologous sides.
Σελίδα 117 - In the same way it may be proved that a : b : : sin. A : sin. B, and these two proportions may be written a : 6 : c : : sin. A : sin. B : sin. C. THEOREM III. t8. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference. By Theorem II. we have a : b : : sin. A : sin. B.
Σελίδα 92 - IN a right-angled triangle, if a perpendicular be drawn from the right angle to the base, the triangles on each side of it are similar to the whole triangle, and to one another.
Σελίδα 79 - THEOREM. lf the first has to the second the same ratio which the third has to the fourth, but the third to the fourth, a greater ratio than the fifth has to the sixth ; the first shall also have to the second a greater ratio than the fifth, has to the sixth.
Σελίδα 87 - If a straight line be drawn parallel to one of the sides of a triangle, it shall cut the other sides, or those sides produced, proportionally...
Σελίδα 26 - Triangles upon equal bases, and between the same parallels, are equal to one another.
Σελίδα 133 - If a straight line stand at right angles to each of two straight lines at the point of their intersection, it shall also be at right angles to the plane which passes through them, that is, to the plane in which they are.
Σελίδα 13 - AB be the greater, and from it cut (3. 1.) off DB equal to AC the less, and join DC ; therefore, because A in the triangles DBC, ACB, DB is equal to AC, and BC common to both, the two sides DB, BC are equal to the two AC, CB. each to each ; and the angle DBC is equal to the angle ACB; therefore the base DC is equal to the base AB, and the triangle DBC is< equal to the triangle (4. 1.) ACB, the less to 'the greater; which is absurd.
Σελίδα 71 - If the first magnitude be the same multiple of the second that the third is of the fourth, and the fifth the same multiple of the second that the sixth is of the fourth ; then shall...
Σελίδα 83 - IF there be any number of magnitudes, and as many others, which, taken two and two, in a cross order, have the same ratio; the first shall have to the last of the first magnitudes the same ratio which the first of the others has to the last. NB This is usually cited by the words