The Elements of Euclid, containing the first six books, with a selection of geometrical problems. To which is added the parts of the eleventh and twelfth books which are usually read at the universities. By J. Martin1874 |
Im Buch
Ergebnisse 1-5 von 27
Seite 11
... angles contained by those sides equal to each other ; ( 1 ) they ... angle BAC equal to the included angle EDF . Then ( 1 ) shall the base BC be ... ACB to DFE . * An abbreviation for quod erat faciendum that is , “ which was ...
... angles contained by those sides equal to each other ; ( 1 ) they ... angle BAC equal to the included angle EDF . Then ( 1 ) shall the base BC be ... ACB to DFE . * An abbreviation for quod erat faciendum that is , “ which was ...
Seite 12
... angle DEF , so that the point A may be on D , and the straight line AB on DE ; then A D B C E F 1. The point B shall ... ACB to the angle DFE . Therefore , if two triangles have two sides of the one equal to two sides , & c . Which ...
... angle DEF , so that the point A may be on D , and the straight line AB on DE ; then A D B C E F 1. The point B shall ... ACB to the angle DFE . Therefore , if two triangles have two sides of the one equal to two sides , & c . Which ...
Seite 13
... angle ACB , and the angle DBC to the angle ECB . A F B 0 9 D E Construction . In BD take any point F ; and from AE the greater , cut off AG equal to AF the less ( I. 3 ) , and join FC , GB . Demonstration . Because AF is equal to AG ...
... angle ACB , and the angle DBC to the angle ECB . A F B 0 9 D E Construction . In BD take any point F ; and from AE the greater , cut off AG equal to AF the less ( I. 3 ) , and join FC , GB . Demonstration . Because AF is equal to AG ...
Seite 14
... angles CBG , BCF , are also equal ; therefore , 6. The remaining angle ABC is equal to the remaining angle ACB , which are the angles at the base of the triangle ABC . And it has also been proved that the angle FBC is equal to the angle ...
... angles CBG , BCF , are also equal ; therefore , 6. The remaining angle ABC is equal to the remaining angle ACB , which are the angles at the base of the triangle ABC . And it has also been proved that the angle FBC is equal to the angle ...
Seite 15
... ABC , because DB is equal to AC , and BC is common to both triangles , B D A C 1 1. The two sides DB , BC are equal to the two sides AC , CB , each to each ; and the angle DBC is equal to the angle ACB ( hyp . ) , therefore 2. The base ...
... ABC , because DB is equal to AC , and BC is common to both triangles , B D A C 1 1. The two sides DB , BC are equal to the two sides AC , CB , each to each ; and the angle DBC is equal to the angle ACB ( hyp . ) , therefore 2. The base ...
Andere Ausgaben - Alle anzeigen
The Elements of Euclid, Containing the First Six Books, with a Selection of ... Euclides Keine Leseprobe verfügbar - 2016 |
Häufige Begriffe und Wortgruppen
AB is equal AC is equal adjacent angles angle ABC angle ACB angle BAC angle BCD angle DEF angle EDF angle equal base BC bisected centre circle ABC circumference constr Demonstration diameter double draw equal angles equal to F equiangular equilateral triangle equimultiples exterior angle given circle given point given straight line gnomon greater ratio inscribed less Let ABC Let the straight meet multiple opposite angle parallel to BC parallelogram perpendicular plane polygon produced proportionals PROPOSITION 13 Q.E.D. PROPOSITION rectangle contained remaining angle right angles segment similar square on AC straight line AB straight line BC straight line drawn Theorem three straight lines tiple touches the circle triangle ABC triangle DEF twice the rectangle wherefore
Beliebte Passagen
Seite 1 - 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 6 - If a straight line meets two straight lines, so as to make the two interior angles on the same side of it taken together less than two right angles...
Seite 232 - If two triangles, which have two sides of the one proportional to two sides of the other, be joined at one angle, so as to have their homologous sides parallel to one another, the remaining sides shall be in a straight line. Let...
Seite 112 - The angle in a semicircle is a right angle; the angle in a segment greater than a semicircle is less than a right angle; and the angle in a segment less than a semicircle is greater than a right angle.
Seite 209 - ... triangles which have one angle in the one equal to one angle in the other, and their sides about the equal angles reciprocally proportional, are equal to one another.
Seite 269 - The areas of two triangles which have an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles. D c A' D' Hyp. In triangles ABC and A'B'C', ZA = ZA'. To prove AABC = ABxAC. A A'B'C' A'B'xA'C' Proof. Draw the altitudes BD and B'D'.
Seite 199 - 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 23 - If two triangles have two angles of the one equal to two angles of the other, each to each, and also one side of the one equal to the corresponding side of the other, the triangles are congruent.
Seite 63 - If a straight line be divided into two equal, and also into two unequal parts, the squares on the two unequal parts are together double of the square on half the line and of the square on the line between the points of section. Let the straight line AB be divided into two equal parts...
Seite 32 - ... twice as many right angles as the figure has sides ; therefore all the angles of the figure together with four right angles, are equal to twice as many right angles as the figure has sides.