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 40.
Σελίδα 7
From the point A to B draw ( Post . ì . ) the straight line AB ; and upon it describe ( I
. 1 . ) the equilateral triangle DAB , and produce ( Post . 2 . ) the straight lines DĂ ,
DB to E and F . From the centre B at the distance BC , describe ( Post . 3 . ) ...
From the point A to B draw ( Post . ì . ) the straight line AB ; and upon it describe ( I
. 1 . ) the equilateral triangle DAB , and produce ( Post . 2 . ) the straight lines DĂ ,
DB to E and F . From the centre B at the distance BC , describe ( Post . 3 . ) ...
Σελίδα 9
But the point B coincides 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 does not coincide with the base EF , two straight lines would inclose a ...
But the point B coincides 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 does not coincide with the base EF , two straight lines would inclose a ...
Σελίδα 10
In BD take any point F , and from AE , the greater , cut off AG equal ( I . 3 . ) to AF ,
the less , and join FC , GB . Because AF is equal ( Constr . ) to AG , and AB (
Hypothesis ) to AC , the two sides FA , AC are equal to the two GA , AB , each to ...
In BD take any point F , and from AE , the greater , cut off AG equal ( I . 3 . ) to AF ,
the less , and join FC , GB . Because AF is equal ( Constr . ) to AG , and AB (
Hypothesis ) to AC , the two sides FA , AC are equal to the two GA , AB , each to ...
Σελίδα 13
A For if the triangle ABC be applied to DEF , so that the point B be on E , and the
straight line BC upon EF ; 1 . The point C shall coincide with the point F , because
BC is equal to EF ; therefore BC coinciding with EF , 2 . BA and AC shall ...
A For if the triangle ABC be applied to DEF , so that the point B be on E , and the
straight line BC upon EF ; 1 . The point C shall coincide with the point F , because
BC is equal to EF ; therefore BC coinciding with EF , 2 . BA and AC shall ...
Σελίδα 16
It is required to draw a straight line perpendicular to AB from the point C . . Take
any point Dupon the other side of AB , and from the centre C , at the distance CD ,
describe ( Post . 3 . ) the circle EGF meeting AB in F , G ; and bisect ( I . 10 . ) ...
It is required to draw a straight line perpendicular to AB from the point C . . Take
any point Dupon the other side of AB , and from the centre C , at the distance CD ,
describe ( Post . 3 . ) the circle EGF meeting AB in F , G ; and bisect ( I . 10 . ) ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
ABCD AC is equal angle ABC angle ACB angle BAC angle BCD angle equal base 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 Let the straight likewise manner meet opposite angles parallel parallelogram pass pentagon perpendicular point F PROBLEM produced Q.E.D. PROP reason rectangle contained rectilineal figure remaining angle required to describe right angles segment semicircle shown 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...