The Element of GeometryW.E. Dean, 1836 - 114 Seiten |
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Seite 13
... sides , equal ; and the two triangles shall be equal , and their other angles shall be equal , each to each , viz . those to which the equal sides are op- posite . Let ABC , DEF be two triangles which have the two sides AB , AC equal to ...
... sides , equal ; and the two triangles shall be equal , and their other angles shall be equal , each to each , viz . those to which the equal sides are op- posite . Let ABC , DEF be two triangles which have the two sides AB , AC equal to ...
Seite 14
... AC , be produced to D and E , the qual to ACB , and the angle CBD to the angle BI ) take any point F , and make AG equal to AF , and join A B C F G E Because AF is equal to AG , and AB to AC , the two sides AF , AC are equal to the two ...
... AC , be produced to D and E , the qual to ACB , and the angle CBD to the angle BI ) take any point F , and make AG equal to AF , and join A B C F G E Because AF is equal to AG , and AB to AC , the two sides AF , AC are equal to the two ...
Seite 15
... sides BD , BC are equal to the two sides AC , BC , each to each ; and the angle DBC is equal to the angle ACB ; therefore ( 4. 1. ) , the base DC is equal to the base AB , and the triangle CBD is equivalent to the triangle ACB , the ...
... sides BD , BC are equal to the two sides AC , BC , each to each ; and the angle DBC is equal to the angle ACB ; therefore ( 4. 1. ) , the base DC is equal to the base AB , and the triangle CBD is equivalent to the triangle ACB , the ...
Seite 16
... side AD A is equal to the side BD , and DC is common , and the angle ADC contained by them , has been C B G proved to be equal to the angle BDC ; therefore ( 4. 1. ) , the tri- angles are equivalent , and the E third side AC is equal to ...
... side AD A is equal to the side BD , and DC is common , and the angle ADC contained by them , has been C B G proved to be equal to the angle BDC ; therefore ( 4. 1. ) , the tri- angles are equivalent , and the E third side AC is equal to ...
Seite 17
... side CF common ; therefore ( 7. 1. ) , the angles CDF , CEF are equal ; and therefore ( 4. 1. ) , the two triangles ... AC be also perpendicular . Produce AB to F , make BF equal to AB , and join FC . Because the angle ABC is a ...
... side CF common ; therefore ( 7. 1. ) , the angles CDF , CEF are equal ; and therefore ( 4. 1. ) , the two triangles ... AC be also perpendicular . Produce AB to F , make BF equal to AB , and join FC . Because the angle ABC is a ...
Andere Ausgaben - Alle anzeigen
The Element of Geometry (Classic Reprint) Formerly Chairman Department of Immunology John Playfair,John Playfair Keine Leseprobe verfügbar - 2017 |
Häufige Begriffe und Wortgruppen
AB is equal AC is equal adjacent angles angle ABC angle ACB angle BAC angle DEF arc AC base BC bisect called centre circle ABCD circle EFGH coincide described diameter divided drawn duplicate ratio equal angles equal circles equal to AC equiangular FGHKL fore four right angles given straight line gnomon greater homologous sides join less Let ABC Let the straight opposite angles parallel parallelogram perpendicular polygon PROB produced Q. E. D. PROP radius rectangle BC rectangle contained rectilineal figure remaining angle right angled triangle secant segment side AC similar sine square of AC straight line AB straight line AC THEOR touches the circle triangle ABC twice the rectangle wherefore whole angle
Beliebte Passagen
Seite 25 - 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 on the line between the points of section, is equal to the square on half the line.
Seite 13 - To draw a straight line through a given point parallel to a given straight line. Let A be the given point, and BC the given straight line ; it is required to draw a straight line E iR.
Seite 4 - To draw a straight line at right angles to a given straight line, from a given point in the same.
Seite 29 - In obtuse-angled triangles, if a perpendicular be drawn from either of the acute angles to the opposite side produced, the square on the side subtending the obtuse angle is greater than the squares on the sides containing the obtuse angle, by twice the rectangle contained by the side...
Seite 90 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, &c.
Seite 87 - ... magnitudes there be taken more than its half, and from the remainder more than its half, and so on, there shall at length remain a magnitude less than the least of the proposed magnitudes.
Seite 1 - If two triangles have two sides of the one equal to two sides of the...
Seite 13 - If a side of any triangle be produced, the exterior angle is equal to the two interior and opposite angles; and the three interior angles of every triangle are together equal to two right angles.
Seite 64 - 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 19 - If a straight line meet two straight lines, so as to make the two interior angles on the same side of it taken together less than two right angles...