Elements of Geometry, Containing the First Six Books of EuclidBaldwin, Cradock, and Joy, 1826 - 180 páginas |
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Página x
... equilateral triangle , the square , and the hexagon ; these , however , when compared with his other inven- tions , will appear but trifles : in Astronomy he is reported to have maintained the true system of the world , which places the ...
... equilateral triangle , the square , and the hexagon ; these , however , when compared with his other inven- tions , will appear but trifles : in Astronomy he is reported to have maintained the true system of the world , which places the ...
Página 2
... equilateral triangle is that which has three equal sides . 24. An isosceles triangle is that which has only two equal sides . 25. A scalene triangle is that which has three unequal sides . 26. Of three sided figures , a right angled ...
... equilateral triangle is that which has three equal sides . 24. An isosceles triangle is that which has only two equal sides . 25. A scalene triangle is that which has three unequal sides . 26. Of three sided figures , a right angled ...
Página 5
... equilateral triangle Let AB be the given finite right line ; it is required upon AB to describe an equilateral triangle . From the centre A with the distance AB de- scribe the circle BCD : a and again from the centre B , with the dis ...
... equilateral triangle Let AB be the given finite right line ; it is required upon AB to describe an equilateral triangle . From the centre A with the distance AB de- scribe the circle BCD : a and again from the centre B , with the dis ...
Página 9
... equilateral triangle is also equiangular . PROPOSITION VI . THEOREM . If two angles of a triangle be equal to one another , the sides subtending the equal angles shall be equal to one another . a 3. 1 . Let ABC be a triangle , having ...
... equilateral triangle is also equiangular . PROPOSITION VI . THEOREM . If two angles of a triangle be equal to one another , the sides subtending the equal angles shall be equal to one another . a 3. 1 . Let ABC be a triangle , having ...
Página 12
... equilateral triangle DEF , and join AF . The angle BAC is bi- sected by the right line AF . For because AD is equal to AE , and af common : the two DA , AF , are equal to the two EA , AF , each to each ; and the base DF is equal to the ...
... equilateral triangle DEF , and join AF . The angle BAC is bi- sected by the right line AF . For because AD is equal to AE , and af common : the two DA , AF , are equal to the two EA , AF , each to each ; and the base DF is equal to the ...
Otras ediciones - Ver todas
Elements of Geometry; Containing the First Six Books of Euclid ... Euclid,John Playfair Vista completa - 1814 |
Términos y frases comunes
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
Pasajes populares
Página 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.
Página 74 - The straight line drawn at right angles to the diameter of a circle, from the extremity of it, falls without the circle...
Página 33 - The complements of the parallelograms, which are about the diameter of any parallelogram, are equal to one another.
Página 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.
Página 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.
Página 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.
Página 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.
Página 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...
Página 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.
Página 88 - From a given circle to cut off a segment, which shall contain an angle equal to a given rectilineal angle.