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 TrigonometryG. Long, 1819 - 333 Seiten |
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Seite 45
... a paral- : E B A D C F lelogram ; and EBCA is equal ( 35. 1. ) to DBCF , because they are upon the same base BC , and between the same parallels BC , EF ; but the triangle ABC is the half of the parallelogram OF GEOMETRY . BOOK I. 45.
... a paral- : E B A D C F lelogram ; and EBCA is equal ( 35. 1. ) to DBCF , because they are upon the same base BC , and between the same parallels BC , EF ; but the triangle ABC is the half of the parallelogram OF GEOMETRY . BOOK I. 45.
Seite 46
... half of the parallelogram EBCA , because the diameter AB bisects ( 34. 1. ) it ; and the triangle DBC is the half of the parallelogram DBCF , because the diameter DC bisects it : And the halves of equal things are equal ( 7. Ax ...
... half of the parallelogram EBCA , because the diameter AB bisects ( 34. 1. ) it ; and the triangle DBC is the half of the parallelogram DBCF , because the diameter DC bisects it : And the halves of equal things are equal ( 7. Ax ...
Seite 56
... half the line . Let the straight line AB be divided into two equal parts in the point C , and into two unequal parts ... half the line bisected , is equal to the square of the straight line which is made up of the half and the part ...
... half the line . Let the straight line AB be divided into two equal parts in the point C , and into two unequal parts ... half the line bisected , is equal to the square of the straight line which is made up of the half and the part ...
Seite 59
... half that line . ” Otherwise : " Because AD is divided any how in C ( 4. 2. ) , AD2 = AC2 + CD2 “ + 2CD.AC . But CD = 2CB : and therefore CD2 = CB2 + BD2 + “ 2CB.BD ( 4. 2. ) = 4CB2 , and also 2CD.AC = 4CB.AC ; therefore , AD AC2 + 4BC2 ...
... half that line . ” Otherwise : " Because AD is divided any how in C ( 4. 2. ) , AD2 = AC2 + CD2 “ + 2CD.AC . But CD = 2CB : and therefore CD2 = CB2 + BD2 + “ 2CB.BD ( 4. 2. ) = 4CB2 , and also 2CD.AC = 4CB.AC ; therefore , AD AC2 + 4BC2 ...
Seite 60
... half and the part produced . Let the straight line AB be bisected in C , and produced to the point D ; the squares ... half a right angle ( 32. 1. ) For the same reason , each of the angles CEB , EBC is half a right angle ; therefore AEB ...
... half and the part produced . Let the straight line AB be bisected in C , and produced to the point D ; the squares ... half a right angle ( 32. 1. ) For the same reason , each of the angles CEB , EBC is half a right angle ; therefore AEB ...
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Häufige Begriffe und Wortgruppen
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 and similar 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 proportionals 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 parallelepipeds spherical angle spherical triangle square straight line AC THEOR third touches the circle triangle ABC triangle DEF wherefore
Beliebte Passagen
Seite 56 - If a straight line be divided into two equal parts, and also into two unequal parts; the rectangle contained by the unequal parts, together with the square of the line between the points of section, is equal to the square of half the line.
Seite 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.
Seite 33 - THE greater angle of every triangle is subtended by the greater side, or has the greater side opposite to it.
Seite 62 - In every triangle, the square on the side subtending either of the acute angles, is less than the squares on the sides containing that angle, by twice the rectangle contained by either of these sides, and the straight line intercepted between the...
Seite 62 - In obtuse-angled triangles, if a perpendicular be drawn from either of the acute angles to the opposite side produced, the square of the side subtending the obtuse angle, is greater than the squares of the sides containing the obtuse angle, by twice the rectangle contained by the side upon which, when produced, the perpendicular falls, and the straight line intercepted without the triangle, between the perpendicular and the obtuse angle. Let ABC be an obtuse-angled triangle, having the obtuse angle...
Seite 130 - 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.
Seite 76 - THE diameter is the greatest straight line in a circle; and, of all others, that which is nearer to the centre is always greater than one more remote ; and the greater is nearer to the centre than the less.* Let ABCD be a circle, of which...
Seite 36 - IF two triangles have two sides of the one equal to two sides of the other, each to each, but the angle contained by the two sides of one of them greater than the angle contained by the two sides equal to them, of the other ; the base of that which has the greater angle shall be greater than the base of the other.
Seite 18 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it.
Seite 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.