The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh and TwelfthBell & Bradfute, 1835 - 513 σελίδες |
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Σελίδα 64
... circumference equal to FG : For , if there can , let it be FK ; and because FK is equal to FG , and FG to FH , FK is ... circumference , whereof one passes through the centre ; of those which fall upon the concave circumference , the ...
... circumference equal to FG : For , if there can , let it be FK ; and because FK is equal to FG , and FG to FH , FK is ... circumference , whereof one passes through the centre ; of those which fall upon the concave circumference , the ...
Σελίδα 65
... circumference equal to DK : For , if there can , let it be DN ; and because DK is equal to DN , and also to DB ; therefore DB is equal to DN , that is , the line nearer to DG the least , is equal to the more remote , which is impossible ...
... circumference equal to DK : For , if there can , let it be DN ; and because DK is equal to DN , and also to DB ; therefore DB is equal to DN , that is , the line nearer to DG the least , is equal to the more remote , which is impossible ...
Σελίδα 66
... circumference more than two equal straight lines , viz . DA , DB , DC , the point D is the centre of the circle . For , if not , let E be the centre , join DE and produce it to the cir- cumference in F , G ; then FG is a diameter of the ...
... circumference more than two equal straight lines , viz . DA , DB , DC , the point D is the centre of the circle . For , if not , let E be the centre , join DE and produce it to the cir- cumference in F , G ; then FG is a diameter of the ...
Σελίδα 67
... circumference of a circle cannot cut another in more " than two points . ' Q. E. D. " " PROP . XI . THEOR . If two circles touch each other internally , the straight line which joins their centres being produced must pass through the ...
... circumference of a circle cannot cut another in more " than two points . ' Q. E. D. " " PROP . XI . THEOR . If two circles touch each other internally , the straight line which joins their centres being produced must pass through the ...
Σελίδα 69
... circumference of the circle ACK , the straight line AC which joins them must fall within the circle ACK : And the circle ACK is without the circle ABC ; and therefore the straight line A K b 2. 3 . C AC is also without the circle ABC ...
... circumference of the circle ACK , the straight line AC which joins them must fall within the circle ACK : And the circle ACK is without the circle ABC ; and therefore the straight line A K b 2. 3 . C AC is also without the circle ABC ...
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The Elements Of Euclid: Viz. The First Six Books, Together With The Eleventh ... Robert Simson,Euclid,John Davidson Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2019 |
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ABC is given altitude angle ABC angle BAC arch base BC BC is equal bisected Book XI centre circle ABCD circumference cone cosine 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 half the perimeter hypotenuse join less Let ABC multiple parallel parallelogram perpendicular point F polygon prism proportionals proposition Q. E. D. PROP radius rectangle CB rectangle contained rectilineal figure remaining angle right angles segment side BC similar sine solid angle solid parallelepiped spherical angle square of AC straight line AB straight line BC tangent THEOR tiple triangle ABC vertex wherefore
Δημοφιλή αποσπάσματα
Σελίδα 47 - 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 of half the line bisected, is equal to the square of the straight line which is made up of the half and the part produced. Let the straight line AB be bisected in C, and produced to D : the rectangle AD, DB, together with the square of CB, shall be equal to the square of CD.
Σελίδα 306 - 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 26 - if a straight line," &c. QED PROP. XXIX. THEOR. See the Jf a straight line fall upon two parallel straight ti?isepropo- 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 54 - In every triangle, the square on the side subtending either of the acute angles, is less than the squares on the sides containing that angle, by twice the rectangle contained by either of these sides, and the straight line intercepted between the...
Σελίδα 170 - EQUIANGULAR parallelograms have to one another the ratio which is compounded of the ratios of their sides.* Let AC, CF be equiangular parallelograms, having the angle BCD equal to the angle ECG : the ratio of the parallelogram AC to the parallelogram CF, is the same with the ratio which is compounded of the ratios of their sides. • See Note. Let BG, CG, be placed in a straight line ; therefore DC and CE are also in a straight line (14.
Σελίδα 153 - 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 30 - And because the angle ABC is equal to the angle BCD, and the angle CBD to the angle ACB...
Σελίδα 28 - 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 64 - ... than the more remote: but of those which fall upon the convex circumference, the least is that between the point without the circle and the diameter; and, of the rest, that which is nearer to the least is always less than the more remote: and only two equal straight lines can be drawn from the point into the circumference, one upon each side of the least.
Σελίδα 5 - If a straight line meet two straight lines, so as to make the two interior angles on the same side of it taken together less than two right angles...