The Elements of Euclid, containing the first six books, with a selection of geometrical problems. To which is added the parts of the eleventh and twelfth books which are usually read at the universities. By J. Martin1874 |
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Σελίδα
... shown . ( c ) In describing the figures , those parts which are given in the enunciation are represented by dark lines , and those which are added in the course of the demonstration by dotted lines . ( d ) In all cases , the figure has ...
... shown . ( c ) In describing the figures , those parts which are given in the enunciation are represented by dark lines , and those which are added in the course of the demonstration by dotted lines . ( d ) In all cases , the figure has ...
Σελίδα 10
... shown that BC is equal to BG ; wherefore , AL and BC are each of them equal to BG ; and things which are equal to the same thing are equal to one another ( Ax . 1 ) ; therefore 4. The straight line AL is equal to BC . Wherefore , from ...
... shown that BC is equal to BG ; wherefore , AL and BC are each of them equal to BG ; and things which are equal to the same thing are equal to one another ( Ax . 1 ) ; therefore 4. The straight line AL is equal to BC . Wherefore , from ...
Σελίδα 12
... shown to coincide with the point E ; wherefore , the base BC shall coincide with the base EF ; because the point B coinciding with E , and C with F , if the base BC do not coincide with the base EF , the two straight lines BC and EF ...
... shown to coincide with the point E ; wherefore , the base BC shall coincide with the base EF ; because the point B coinciding with E , and C with F , if the base BC do not coincide with the base EF , the two straight lines BC and EF ...
Σελίδα 25
... shown to be equal to two right angles , therefore take away 3. The angles CEA , AED are equal to the angles AED , DEB ( Ax . 1 ) ; from each the common angle AED , and 4. The remaining angle CEA is equal to the remaining angle DEB ( Ax ...
... shown to be equal to two right angles , therefore take away 3. The angles CEA , AED are equal to the angles AED , DEB ( Ax . 1 ) ; from each the common angle AED , and 4. The remaining angle CEA is equal to the remaining angle DEB ( Ax ...
Σελίδα 29
... shown to be not equal to AB , therefore 3. AC is greater than AB . Wherefore the greater angle , & c . Q.E.D. PROPOSITION 20. - Theorem . Any two sides of a triangle are together greater than the third side . Let ABC be a triangle ...
... shown to be not equal to AB , therefore 3. AC is greater than AB . Wherefore the greater angle , & c . Q.E.D. PROPOSITION 20. - Theorem . Any two sides of a triangle are together greater than the third side . Let ABC be a triangle ...
Άλλες εκδόσεις - Προβολή όλων
The Elements of Euclid, Containing the First Six Books, with a Selection of ... Euclides Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2016 |
Συχνά εμφανιζόμενοι όροι και φράσεις
AC is equal adjacent angles angle ABC angle ACB angle BAC angle BCD angle DEF angle EDF angle equal base BC bisected centre circle ABC circumference constr Demonstration diameter double equal angles equal to F equiangular equilateral triangle equimultiples ex æquali exterior angle fourth given circle given point given straight line gnomon greater ratio inscribed less Let ABC Let the straight linear units meet multiple opposite angle parallel to BC parallelogram perpendicular plane polygon produced proportionals Q.E.D. PROPOSITION quadrilateral rectangle contained remaining angle right angles segment semicircle similar square on AC straight line AB straight line BC straight line drawn three straight lines tiple touches the circle triangle ABC triangle DEF twice the rectangle wherefore
Δημοφιλή αποσπάσματα
Σελίδα 1 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.
Σελίδα 6 - If a straight line meets two straight lines, so as to make the two interior angles on the same side of it taken together less than two right angles...
Σελίδα 232 - If two triangles, which have two sides of the one proportional to two sides of the other, be joined at one angle, so as to have their homologous sides parallel to one another, the remaining sides shall be in a straight line. Let...
Σελίδα 112 - 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 209 - ... triangles which have one angle in the one equal to one angle in the other, and their sides about the equal angles reciprocally proportional, are equal to one another.
Σελίδα 269 - The areas of two triangles which have an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles. D c A' D' Hyp. In triangles ABC and A'B'C', ZA = ZA'. To prove AABC = ABxAC. A A'B'C' A'B'xA'C' Proof. Draw the altitudes BD and B'D'.
Σελίδα 199 - 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 23 - 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 63 - If a straight line be divided into two equal, and also into two unequal parts, the squares on the two unequal parts are together double of the square on half the line and of the square on the line between the points of section. Let the straight line AB be divided into two equal parts...
Σελίδα 32 - ... twice as many right angles as the figure has sides ; therefore all the angles of the figure together with four right angles, are equal to twice as many right angles as the figure has sides.