A school Euclid, being books i. & ii. of Euclid's Elements, with notes by C. Mansford1874 |
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Σελίδα vi
... reason geometry is called an ' abstract science . ' A further point to be noticed in regard to the definitions is the relation in which they stand to the whole system of geometry . It has been already remarked that they form the ...
... reason geometry is called an ' abstract science . ' A further point to be noticed in regard to the definitions is the relation in which they stand to the whole system of geometry . It has been already remarked that they form the ...
Σελίδα viii
... reason about them and deduce general truths . But this is not the case in regard to ' straight lines , ' ' right angles ' and parallel lines . ' Concerning these Euclid enunciates other properties in the 10th , 11th and 12th axioms ...
... reason about them and deduce general truths . But this is not the case in regard to ' straight lines , ' ' right angles ' and parallel lines . ' Concerning these Euclid enunciates other properties in the 10th , 11th and 12th axioms ...
Σελίδα 21
... of five circles . The reason of this is also explained on p . 8 . Ex . Show how to produce the less of two lines until it is equal to the greater . PROPOSITION 4. THEOREM . If two triangles have two sides BOOK I. 3 . 21.
... of five circles . The reason of this is also explained on p . 8 . Ex . Show how to produce the less of two lines until it is equal to the greater . PROPOSITION 4. THEOREM . If two triangles have two sides BOOK I. 3 . 21.
Σελίδα 30
... reason of which is obvious . Ex . 1. If two isosceles triangles be described on opposite sides of the same base the straight line joining their vertices will bisect their common base at right angles . [ See fig . to the prop . ] 2. If ...
... reason of which is obvious . Ex . 1. If two isosceles triangles be described on opposite sides of the same base the straight line joining their vertices will bisect their common base at right angles . [ See fig . to the prop . ] 2. If ...
Σελίδα 43
... reason , the exterior angle CEB of the triangle ABE is greater than the angle BAE ; much more then is the angle BDC greater than the angle BAC . Therefore , if from the ends , & c . Q.E.D. Unless the lines are drawn from " the ends of ...
... reason , the exterior angle CEB of the triangle ABE is greater than the angle BAE ; much more then is the angle BDC greater than the angle BAC . Therefore , if from the ends , & c . Q.E.D. Unless the lines are drawn from " the ends of ...
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A School Euclid, Being Books I. & II. of Euclid's Elements, with Notes by C ... Euclides Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2015 |
Συχνά εμφανιζόμενοι όροι και φράσεις
AC is equal adjacent angles alternate angles angle ABC angle ACB angle AGH angle BAC angle BCD angle DBA angle EDF angle equal angles are equal axioms base BC bisect centre circle coincide Const diagonals diameter double equal sides equal to BC equal to twice equilateral triangle Euclid EUCLID'S ELEMENTS exterior angle fore four right angles given point given rectilineal angle given straight line gnomon half a right hypotenuse interior and opposite isosceles triangle join Let ABC Let the straight obtuse opposite angle opposite sides parallel to CD parallelogram parallelogram ABCD perpendicular produced prop quadrilateral rectangle AC rectangle contained remaining angle rhombus right angles right-angled triangle shew side BC sides equal square described square on AC THEOREM third angle triangle ABC triangle DEF truths twice the rectangle unequal
Δημοφιλή αποσπάσματα
Σελίδα 90 - If a straight line be divided into any two parts, the squares of the whole line, and of one of the parts, are equal to twice the rectangle contained by the whole and that part, together with the square of the other part.
Σελίδα 28 - If two triangles have two sides of the one equal to two sides of the...
Σελίδα 41 - Any two sides of a triangle are together greater than the third side.
Σελίδα 57 - 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 equal to two right angles.
Σελίδα 72 - To describe a parallelogram equal to a given rectilineal figure, and having an angle equal to a given rectilineal angle. Let ABCD be the given rectilineal figure, and E the given rectilineal angle. It is required to describe a parallelogram equal to ABCD, and having an angle equal to E.
Σελίδα 75 - In any right-angled triangle, the square which is described upon the side subtending the right angle, is equal to the squares described upon the sides which contain the right angle.
Σελίδα 89 - 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...
Σελίδα 55 - IF a straight line fall upon two parallel straight lines, it makes the alternate angles equal to one another; and the exterior angle equal to the interior and opposite upon the same side; and likewise the two interior angles upon the same side together equal to two right angles...
Σελίδα 28 - A two triangles, having the two sides AB, AC, equal to the two sides \ DE, DF, each to each, viz: AB to DE, and AC to DF; and also the base BC equal to the base EF.
Σελίδα 69 - To a given straight line to apply a parallelogram, which shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.