Elements of Geometry: Containing the First Six Books of Euclid, with a Supplement on the Quadrature of the Circle, and the Geometry of Solids; to which are Added Elements of Plane and Spherical Trigonometry |
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Σελίδα 32
Let ABC be any triangle ; any A two of its angles together are less than two right
angles . Produce BC to D ; and because ACD is the exterior angle of the triangle
ABC , ACD is greater ( 16. 1. ) than the interior and opposite angle ABC ; to each
...
Let ABC be any triangle ; any A two of its angles together are less than two right
angles . Produce BC to D ; and because ACD is the exterior angle of the triangle
ABC , ACD is greater ( 16. 1. ) than the interior and opposite angle ABC ; to each
...
Σελίδα 95
AG , make the angle GAB equalto the angleDFE , and join G BC . Therefore ,
because А H HAG touches the circle ABC and AC is drawn from the point of
contact , the angle D HAC is equal ( 32. 3. ) to the angle ABC in the alternate
segment of ...
AG , make the angle GAB equalto the angleDFE , and join G BC . Therefore ,
because А H HAG touches the circle ABC and AC is drawn from the point of
contact , the angle D HAC is equal ( 32. 3. ) to the angle ABC in the alternate
segment of ...
Σελίδα 130
D the angle FEG equal to the angle ABC , and the angle EFG eA. qual to BCA ;
wherefore the remaining angle BAC is equal to E the remaining angle EGF ( 32.1
. ) , and the triangle ABC is therefore equiangular to the triangle GEF ; and ...
D the angle FEG equal to the angle ABC , and the angle EFG eA. qual to BCA ;
wherefore the remaining angle BAC is equal to E the remaining angle EGF ( 32.1
. ) , and the triangle ABC is therefore equiangular to the triangle GEF ; and ...
Σελίδα 225
The radius is a mean proportional between the tangent and the cotangent of any
angle ABC , that is , tan . ABC Xcot . ABC R ? .. For , since HK , BA are parallel ,
the angles HKB , ABC are equal , and KHB , BAE are right angles ; therefore the ...
The radius is a mean proportional between the tangent and the cotangent of any
angle ABC , that is , tan . ABC Xcot . ABC R ? .. For , since HK , BA are parallel ,
the angles HKB , ABC are equal , and KHB , BAE are right angles ; therefore the ...
Σελίδα 259
D line DF is at right angles to both FA and FE , it will also be at right angles to the
plane AEF ( 4.2 . ... or is equal to the spherical angle ABC : Therefore the sine of
the arch AB is to the radius as the tangent of the arch AC to the tangent of the ...
D line DF is at right angles to both FA and FE , it will also be at right angles to the
plane AEF ( 4.2 . ... or is equal to the spherical angle ABC : Therefore the sine of
the arch AB is to the radius as the tangent of the arch AC to the tangent of the ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
ABCD altitude angle ABC angle BAC arch base bisected Book called centre circle circle ABC circumference coincide common cosine cylinder definition demonstrated described diameter difference divided double draw drawn equal equal angles equiangular Euclid extremity fall fore four fourth given given straight line greater half inscribed interior join less Let ABC magnitudes manner meet multiple opposite parallel parallelogram pass perpendicular plane polygon prism produced PROP proportionals proposition proved Q. E. D. PROP radius ratio reason rectangle contained rectilineal figure right angles segment shewn sides similar sine solid square straight line taken tangent THEOR thing third touches triangle ABC wherefore whole
Δημοφιλή αποσπάσματα
Σελίδα 56 - If a straight line be divided into two equal parts, and also into two unequal parts; the rectangle contained by the unequal parts, together with the square of the line between the points of section, is equal to the square of half the line.
Σελίδα 19 - 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 33 - THE greater angle of every triangle is subtended by the greater side, or has the greater side opposite to it.
Σελίδα 62 - 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 62 - In obtuse-angled triangles, if a perpendicular be drawn from either of the acute angles to the opposite side produced, the square of the side subtending the obtuse angle, is greater than the squares of the sides containing the obtuse angle, by twice the rectangle contained by the side upon which, when produced, the perpendicular falls, and the straight line intercepted without the triangle, between the perpendicular and the obtuse angle. Let ABC be an obtuse-angled triangle, having the obtuse angle...
Σελίδα 130 - 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 76 - THE diameter is the greatest straight line in a circle; and, of all others, that which is nearer to the centre is always greater than one more remote ; and the greater is nearer to the centre than the less.* Let ABCD be a circle, of which...
Σελίδα 36 - IF two triangles have two sides of the one equal to two sides of the other, each to each, but the angle contained by the two sides of one of them greater than the angle contained by the two sides equal to them, of the other ; the base of that which has the greater angle shall be greater than the base of the other.
Σελίδα 18 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it.
Σελίδα 55 - If a straight line be divided into any two parts, the rectangle contained by the whole and one of the parts, is equal to the rectangle contained by the two parts, together with the square of the aforesaid part.
Πληροφορίες βιβλιογραφίας
| Τίτλος | Elements of Geometry: Containing the First Six Books of Euclid, with a Supplement on the Quadrature of the Circle, and the Geometry of Solids; to which are Added Elements of Plane and Spherical Trigonometry |
| Συγγραφέας | John Playfair |
| Επιμελητής | John Playfair |
| Μεταφράστηκε από | John Playfair |
| Έκδοση | 5 |
| Εκδότης | G. Long, 1819 |
| Πρωτότυπο από | το Πανεπιστήμιο του Μίτσιγκαν |
| Ψηφιοποιήθηκε στις | 11 Ιουν. 2007 |
| Μέγεθος | 333 σελίδες |
| Εξαγωγή αναφοράς | BiBTeX EndNote RefMan |