Euclid's Elements of Geometry, Bücher 1-6;Bücher 11Henry Martyn Taylor The University Press, 1895 - 657 Seiten |
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Seite 9
Henry Martyn Taylor. A DEFINITION 11. If two adjacent angles made by two straight lines at the point where they meet be equal , each of these angles is called a right angle , and the straight lines are said to be at right angles to each ...
Henry Martyn Taylor. A DEFINITION 11. If two adjacent angles made by two straight lines at the point where they meet be equal , each of these angles is called a right angle , and the straight lines are said to be at right angles to each ...
Seite 36
... right angles to the given straight line . From the point C in the straight line AB let the straight line CD be drawn at right angles to AB : it is required to prove that no other straight line can be drawn from C at right angles to AB ...
... right angles to the given straight line . From the point C in the straight line AB let the straight line CD be drawn at right angles to AB : it is required to prove that no other straight line can be drawn from C at right angles to AB ...
Seite 37
... angles CEA , CEB right angles ; ( Def . 11. ) and let the straight lines FG , HK meet at L and make the angles HLF , HLG right angles : it is required to prove that the angle CEA is equal to the angle HLF . H F L G A E B K PROOF . If ...
... angles CEA , CEB right angles ; ( Def . 11. ) and let the straight lines FG , HK meet at L and make the angles HLF , HLG right angles : it is required to prove that the angle CEA is equal to the angle HLF . H F L G A E B K PROOF . If ...
Seite 38
... right angles to AB . CONSTRUCTION . Take any point D in AC , and from CB cut off CE equal to CD . ( Prop . 3. ) On DE construct an equilateral triangle DFE , ( Prop . 1. ) and draw CF : then CF is a straight line drawn as required ...
... right angles to AB . CONSTRUCTION . Take any point D in AC , and from CB cut off CE equal to CD . ( Prop . 3. ) On DE construct an equilateral triangle DFE , ( Prop . 1. ) and draw CF : then CF is a straight line drawn as required ...
Seite 39
... angle PCA is equal to the angle PCB , and since they are adjacent angles each is a right angle . ( Prop . 8. ) It follows that , if P be equidistant from A and B , it must lie on the straight line CP which bisects AB at right angles ...
... angle PCA is equal to the angle PCB , and since they are adjacent angles each is a right angle . ( Prop . 8. ) It follows that , if P be equidistant from A and B , it must lie on the straight line CP which bisects AB at right angles ...
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Häufige Begriffe und Wortgruppen
ABCD ADDITIONAL PROPOSITION AE is equal angle ABC angle ACB angle BAC angular points bisected bisectors centre of similitude chord circle ABC circumscribed circle coincide CONSTRUCTION Coroll cut the circle describe a circle diagonals diameter equal angles equiangular equilateral triangle Euclid EXERCISES figure fixed point given circle given point given straight line given triangle greater harmonic range hypotenuse inscribed circle intersect isosceles triangle Let ABC locus magnitudes meet middle points opposite sides pairs parallel parallelepiped parallelogram perpendicular plane angles polygon PROOF Prop quadrilateral radical axis radius rectangle contained regular polygon required to prove respectively rhombus right angles right-angled triangle shew side BC Similarly solid angle sphere square on AC straight line drawn straight line joining tangent tetrahedron theorem triangle ABC triangles are equal trihedral angle twice the rectangle vertex vertices Wherefore
Beliebte Passagen
Seite 70 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz.
Seite 218 - The angle which an arc of a circle subtends at the centre is double that which it subtends at any point on the remaining part of the circumference.
Seite 279 - If a straight line be bisected and produced to any point, the rectangle contained by the whole line thus produced and the part of it produced, together •with the square...
Seite 148 - If a straight line be divided into any two parts, the squares on the whole line, and on one of the parts, are equal to twice the rectangle contained by the whole and that part, together with the square on the other part.
Seite 137 - If there be two straight lines, one of which is divided into any number of parts, the rectangle contained by the two straight lines is equal to the rectangles contained by the undivided line, and the several parts of the divided line.
Seite 372 - To find a mean proportional between two given straight lines. Let AB, BC be the two given straight lines ; it is required to find a mean proportional between them. Place AB, BC in a straight line, and upon AC describe the semicircle ADC, and from the point B draw (9.
Seite 78 - ... the same side together equal to two right angles ; the two straight lines shall be parallel to one another.
Seite 303 - To inscribe, an equilateral and equiangular pentagon in a given circle. Let ABCDE be the given circle. It is required to inscribe an equilateral...
Seite 420 - PROPOSITION 5. The locus of a point, the ratio of whose distances from two given points is constant, is a circle*.
Seite 300 - To inscribe a circle in a given square. Let ABCD be the given square ; it is required to inscribe a circle in ABCD.