The synoptical Euclid; being the first four books of Euclid's Elements of geometry, with exercises, by S.A. Good |
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Αποτελέσματα 1 - 5 από τα 19.
Σελίδα 12
The angle ACD is equal to the angle ADC . But the angle ACD is greater than the angle BCD ( Ax . 9. ) ; therefore also 2. The angle ADC is greater than BCD ; much more then 3. The angle BDC is greater than the angle BCD .
The angle ACD is equal to the angle ADC . But the angle ACD is greater than the angle BCD ( Ax . 9. ) ; therefore also 2. The angle ADC is greater than BCD ; much more then 3. The angle BDC is greater than the angle BCD .
Σελίδα 14
AB is cut into two equal parts in the point D. C A. D B Because AC is equal to CB , and CD common to the two triangles ACD , BCD ; 1. The two sides AC , CD are equal to BC , CD , each to each ; and ( Constr . ) 2. The angle ACD is equal ...
AB is cut into two equal parts in the point D. C A. D B Because AC is equal to CB , and CD common to the two triangles ACD , BCD ; 1. The two sides AC , CD are equal to BC , CD , each to each ; and ( Constr . ) 2. The angle ACD is equal ...
Σελίδα 22
The angle ADC is equal to ACD ; 1 . but the angle BCD is greater than the angle ACD ; therefore 2. The angle BCD is greater than the angle ADC ; and because the angle BCD of the triangle DCB is greater than its angle BDC , and that the ...
The angle ADC is equal to ACD ; 1 . but the angle BCD is greater than the angle ACD ; therefore 2. The angle BCD is greater than the angle ADC ; and because the angle BCD of the triangle DCB is greater than its angle BDC , and that the ...
Σελίδα 33
The alternate angles ABC , BCD , are equal . and because AB is equal to CD , and BC common to the two triangles ABC , DCB , the two sides AB , BC , are equal to the two DC , CB ; and the angle ABC is equal to the angle BCD ; therefore ...
The alternate angles ABC , BCD , are equal . and because AB is equal to CD , and BC common to the two triangles ABC , DCB , the two sides AB , BC , are equal to the two DC , CB ; and the angle ABC is equal to the angle BCD ; therefore ...
Σελίδα 34
The alternate angles ABC , BCD , are equal to one another ; and because AC is parallel to BD , and BC meets them , ( I. 29. ) 2. The alternate angles ACB , CBD , are equal to one another ; wherefore the two triangles ABC , CBD , have ...
The alternate angles ABC , BCD , are equal to one another ; and because AC is parallel to BD , and BC meets them , ( I. 29. ) 2. The alternate angles ACB , CBD , are equal to one another ; wherefore the two triangles ABC , CBD , have ...
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ABCD AC is equal AF is equal angle ABC angle ACB angle BAC angle BCD angle equal base BC bisected centre circle ABC circumference coincide common demonstrated describe diameter distance divided double draw equal angles equal Constr exterior angle extremity fall figure four given circle given point given straight line given triangle greater impossible inscribed join less Let ABC likewise manner meet opposite angles parallel parallelogram pass pentagon perpendicular point F produced Q.E.D. PROP reason rectangle contained rectilineal figure remaining angle required to describe right angles segment semicircle shown side BC sides square of AC straight line AC touches the circle triangle ABC twice the rectangle wherefore whole
Δημοφιλή αποσπάσματα
Σελίδα 26 - 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 22 - If from the ends of a side of a triangle, there be drawn two straight lines to a point within the triangle, these shall be less than the other two sides of the triangle, but shall contain a greater angle.
Σελίδα 32 - 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 1 - A plane superficies is that in which any two points being taken, the straight line between them lies wholly in that superficies. vm. "A plane angle is the inclination of two lines to one another in a plane, which meet together, but are not in the same direction.
Σελίδα 97 - If from any point without a circle two straight lines be drawn, one of which cuts the circle, and the other touches it ; the rectangle contained by the whole line which cuts the circle, and the part of it without the circle, shall be equal to the square of the line which touches it.
Σελίδα 7 - AB; but things which are equal to the same are equal to one another...
Σελίδα 14 - To bisect a given finite straight line, that is, to divide it into two equal parts. Let AB be the given straight line : it is required to divide it intotwo equal parts.
Σελίδα 53 - 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 41 - 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.
Σελίδα 52 - 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...