A Text-book of Euclid's Elements for the Use of Schools, Βιβλίο 1Macmillan, 1904 - 456 σελίδες |
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Σελίδα vii
... retention of the formal , if some- what cumbrous , methods of Euclid in many places where proofs of greater brevity and mathematical elegance are available . We hope that the additional matter introduced into the book PREFACE . vii.
... retention of the formal , if some- what cumbrous , methods of Euclid in many places where proofs of greater brevity and mathematical elegance are available . We hope that the additional matter introduced into the book PREFACE . vii.
Σελίδα ix
... greater clearness and simplicity . References to the Definitions being frequent in the text of Book I. , the convenience of a standard order has been pointed out to us by many elementary teachers . We have therefore thought it advisable ...
... greater clearness and simplicity . References to the Definitions being frequent in the text of Book I. , the convenience of a standard order has been pointed out to us by many elementary teachers . We have therefore thought it advisable ...
Σελίδα 2
... greater than the angle AOB . Thus an angle must be regarded as having magnitude . O A A It must be carefully observed that the size of an angle in no way depends on the length of its arms , but only on their inclination to one another ...
... greater than the angle AOB . Thus an angle must be regarded as having magnitude . O A A It must be carefully observed that the size of an angle in no way depends on the length of its arms , but only on their inclination to one another ...
Σελίδα 3
... greater than the angle AOB . ] Angles which lie on either side of a common arm are called adjacent angles . For example , when one straight line OC is drawn from a point in another straight line AB , the angles COA , COB are adjacent ...
... greater than the angle AOB . ] Angles which lie on either side of a common arm are called adjacent angles . For example , when one straight line OC is drawn from a point in another straight line AB , the angles COA , COB are adjacent ...
Σελίδα 8
... greater sum being that which includes the greater of the unequals . 5. If equals be taken from unequals , the remainders are unequal , the greater remainder being that which is left from the greater of the unequals . 6. Things which are ...
... greater sum being that which includes the greater of the unequals . 5. If equals be taken from unequals , the remainders are unequal , the greater remainder being that which is left from the greater of the unequals . 6. Things which are ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
ABCD AC is equal adjacent angles Algebra angle BAC angle equal base BC bisected bisectors centre chord circumference circumscribed circle concyclic Constr Describe a circle diagonal diameter divided equal angles equiangular Euclid Euclid's exterior angle find the locus given circle given point given straight line given triangle greater Hence hypotenuse inscribed circle isosceles triangle Let ABC line which joins magnitudes meet middle point nine-points circle opposite sides orthocentre par¹ parallelogram parm pass pedal triangle perp perpendiculars drawn plane XY polygon produced Proof proportional PROPOSITION PROPOSITION 13 prove quadrilateral radical axis radius rectangle contained rectilineal figure regular polygon right angles segment shew shewn side BC Similarly square straight line drawn tangent THEOREM triangle ABC twice the rect vertex vertical angle
Δημοφιλή αποσπάσματα
Σελίδα 353 - Pythagoras' theorem states that the square of the length of the hypotenuse of a right-angled triangle is equal to the sum of the squares of the lengths of the other two sides.
Σελίδα 340 - 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.
Σελίδα 65 - 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.
Σελίδα 162 - AB into two parts, so that the rectangle contained by the whole line and one of the parts, shall be equal to the square on the other part.
Σελίδα 326 - From this it is manifest that prisms upon triangular bases, of the same altitude, are to one another as their bases. Let the...
Σελίδα 162 - 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...
Σελίδα 291 - The side of a regular hexagon inscribed in a circle is equal to the radius of the circle.
Σελίδα 79 - The straight line joining the middle points of two sides of a triangle is parallel to the third side and equal to half of it 46 INTERCEPTS BY PARALLEL LINES.
Σελίδα 18 - THE angles at the base of an isosceles triangle are equal to one another : and, if the equal sides be produced, the angles upon the other side of the base shall be equal.
Σελίδα 242 - We may here notice that the perpendiculars from the vertices of a triangle to the opposite sides are concurrent ; their meet is called the orthocentre, and the triangle obtained by joining the feet of the perpendiculars is called the pedal triangle.