Euclid's Elements of Geometry, Bücher 1-6;Bücher 11Henry Martyn Taylor The University Press, 1895 - 657 Seiten |
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Seite 11
... triangle . A closed rectilineal figure , which has four sides , is called a quadrilateral A closed rectilineal ... right angle , is called right - angled . The side opposite to the right angle is called the hypo- tenuse § . * A figure ...
... triangle . A closed rectilineal figure , which has four sides , is called a quadrilateral A closed rectilineal ... right angle , is called right - angled . The side opposite to the right angle is called the hypo- tenuse § . * A figure ...
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
... triangles PCA , PCB , C B PA is equal to PB , PC to PC , and AC to BC , the two triangles are equal in all respects : therefore the angle PCA is equal to the angle PCB , and since they are adjacent angles each is a right angle . ( Prop ...
... triangles PCA , PCB , C B PA is equal to PB , PC to PC , and AC to BC , the two triangles are equal in all respects : therefore the angle PCA is equal to the angle PCB , and since they are adjacent angles each is a right angle . ( Prop ...
Seite 43
... right angles ; ( Constr . ) therefore the sum of the angles DBA , ABC is equal to two right angles . Wherefore , the ... angled triangles have their hypotenuses equal and two other angles equal , the triangles are equal in all respects ...
... right angles ; ( Constr . ) therefore the sum of the angles DBA , ABC is equal to two right angles . Wherefore , the ... angled triangles have their hypotenuses equal and two other angles equal , the triangles are equal in all respects ...
Seite 49
... triangle to any point in the opposite side BC between B and C that the angles ABC , BCA are together less than two right ... angled triangles , which have their hypotenuses equal and one side equal to one side , are equal in all respects . 4 ...
... triangle to any point in the opposite side BC between B and C that the angles ABC , BCA are together less than two right ... angled triangles , which have their hypotenuses equal and one side equal to one side , are equal in all respects . 4 ...
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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.