Euclid's Elements: Or, Second Lessons in Geometry,in the Order of Simson's and Playfair's Editions ...Collins, Brother & Company, 1846 - 138 páginas |
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Página 7
... angles equal , or when it pends , or hangs upon the other as the plumbline upon the level : lines meet when they ... right , or ob- tuse ; the acute and obtuse are called oblique angles . Salient and re- entrant angles are the outward ...
... angles equal , or when it pends , or hangs upon the other as the plumbline upon the level : lines meet when they ... right , or ob- tuse ; the acute and obtuse are called oblique angles . Salient and re- entrant angles are the outward ...
Página 8
... angles are the outward angles in fortifications ; the former are greater and ... right angle is the declination of two straight lines to one - fourth of the ... angles . 17. A semicircle is a figure contained by the diameter and half the ...
... angles are the outward angles in fortifications ; the former are greater and ... right angle is the declination of two straight lines to one - fourth of the ... angles . 17. A semicircle is a figure contained by the diameter and half the ...
Página 9
... angles , viz : A trigon has three equal angles . A tetragon has four 33 " " A pentagon has five 99 99 A hexagon has ... right angles are equal to one another ; and so are all angles measured by equal arcs to equal radii . 11. Two ...
... angles , viz : A trigon has three equal angles . A tetragon has four 33 " " A pentagon has five 99 99 A hexagon has ... right angles are equal to one another ; and so are all angles measured by equal arcs to equal radii . 11. Two ...
Página 15
... angles ACD , BCD : therefore , the bases AD and BD are equal , and AB is cut into two equal parts in the point D. Which was to be done . Recite ( a ) , prop . 1 ; ( b ) , prop . 9 . A 11 P. To draw a straight line ( CF ) , at right angles ...
... angles ACD , BCD : therefore , the bases AD and BD are equal , and AB is cut into two equal parts in the point D. Which was to be done . Recite ( a ) , prop . 1 ; ( b ) , prop . 9 . A 11 P. To draw a straight line ( CF ) , at right angles ...
Página 16
... right angles to AB ( a ) then if ABC be a straight line , EBC is a right angle ; and if ABD be a straight line , EBD is a right angle ; and so two right angles are unequal , which is impossible , ( b ) : A therefore the lines , ABC ...
... right angles to AB ( a ) then if ABC be a straight line , EBC is a right angle ; and if ABD be a straight line , EBD is a right angle ; and so two right angles are unequal , which is impossible , ( b ) : A therefore the lines , ABC ...
Otras ediciones - Ver todas
Euclid's Elements, Or Second Lessons in Geometry, in the Order of Simson's ... D. M'Curdy Sin vista previa disponible - 2017 |
Euclid's Elements, Or Second Lessons in Geometry, in the Order of Simson's ... D. M'Curdy Sin vista previa disponible - 2017 |
Términos y frases comunes
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
Pasajes populares
Página 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.
Página 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.
Página 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.
Página 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.
Página 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...
Página 26 - Triangles upon equal bases, and between the same parallels, are equal to one another.
Página 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.
Página 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.
Página 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...
Página 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