The Elements of EuclidDesilver, Thomas, 1838 - 416 σελίδες |
Αναζήτηση στο βιβλίο
Αποτελέσματα 1 - 5 από τα 100.
Σελίδα 10
... ABC shall be an equilateral triangle . C A B Ε Because the point A is the centre of the circle BCD , AC is equal ( 15. Definition . ) to AB ; and because the point B is the centre of the circle ACE , BC is equal to BA : but it has been ...
... ABC shall be an equilateral triangle . C A B Ε Because the point A is the centre of the circle BCD , AC is equal ( 15. Definition . ) to AB ; and because the point B is the centre of the circle ACE , BC is equal to BA : but it has been ...
Σελίδα 11
... ABC , DEF be two triangles which have the two sides AB , AC equal to the two sides DE , DF , each to each , viz . AB ... triangle ABC to the triangle DEF ; and the other angles , to which the equal sides are opposite , shall be equal ...
... ABC , DEF be two triangles which have the two sides AB , AC equal to the two sides DE , DF , each to each , viz . AB ... triangle ABC to the triangle DEF ; and the other angles , to which the equal sides are opposite , shall be equal ...
Σελίδα 12
... triangle ABC shall coincide with the whole triangle DEF , and be equal to it ; and the other angles of the one shall coincide with the remaining angles of the other and be equal to them , viz , the angle ABC to the angle DEF , and the angle ...
... triangle ABC shall coincide with the whole triangle DEF , and be equal to it ; and the other angles of the one shall coincide with the remaining angles of the other and be equal to them , viz , the angle ABC to the angle DEF , and the angle ...
Σελίδα 13
... triangle ABC : and it has also been proved that the angle FBC is equal to the angle GCB , which are the an- gles ... triangle is also equian- PROP . VI . THEOR . Ir two angles of a triangle be equal to one another , the sides also which ...
... triangle ABC : and it has also been proved that the angle FBC is equal to the angle GCB , which are the an- gles ... triangle is also equian- PROP . VI . THEOR . Ir two angles of a triangle be equal to one another , the sides also which ...
Σελίδα 15
Euclid Robert Simson. For , if the triangle ABC be applied to DEF , so that the point B be on E , and the straight line BC upon EF ; the point C shall also coincide with the point F. Because BC is equal to EF ; therefore BC coinciding ...
Euclid Robert Simson. For , if the triangle ABC be applied to DEF , so that the point B be on E , and the straight line BC upon EF ; the point C shall also coincide with the point F. Because BC is equal to EF ; therefore BC coinciding ...
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
altitude angle ABC angle BAC base BC BC is equal BC is given bisected centre circle ABCD circumference cone cylinder demonstrated described diameter draw drawn equal angles equiangular equimultiples Euclid ex æquali excess fore given angle given in magnitude given in position given in species given magnitude given ratio given straight line gles gnomon greater join less Let ABC multiple parallel parallelogram parallelogram AC perpendicular point F polygon prism proportionals proposition pyramid Q. E. D. PROP radius ratio of AE rectangle CB rectangle contained rectilineal figure remaining angle right angles segment sides BA similar sine solid angle solid parallelopiped square of AC square of BC straight line AB straight line BC tangent THEOR triangle ABC triplicate ratio vertex wherefore
Δημοφιλή αποσπάσματα
Σελίδα 34 - 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. Let the straight line AB be divided into any two parts at the point C : the squares of AB, BC shall be equal to twice the rectangle AB, BC, together with the square of AC.
Σελίδα 143 - Wherefore, in equal circles &c. QED PROPOSITION B. THEOREM If the vertical angle of a triangle be bisected by a straight line which likewise cuts the base, the rectangle contained by the sides of the triangle is equal to the rectangle contained by the segments of the base, together with the square on the straight line which bisects the angle.
Σελίδα 63 - 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.
Σελίδα 246 - Again ; the mathematical postulate, that " things which are equal to the same are equal to one another," is similar to the form of the syllogism in logic, which unites things agreeing in the middle term.
Σελίδα 9 - If one side of a triangle be produced, the exterior angle is greater than either of the interior opposite angles.
Σελίδα 119 - 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 19 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Σελίδα 12 - To construct a triangle of which the sides shall be equal to three given straight lines ; but any two whatever of these lines must be greater than the third (20.
Σελίδα 78 - 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. either the sides adjacent to the equal...
Σελίδα 131 - ... rectilineal figures are to one another in the duplicate ratio of their homologous sides.