The first book of Euclid's Elements, simplified, explained and illustrated, by W. Trollope |
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Σελίδα 6
An acute angle is that which is less than a right angle . Thus the angles ABC ,
ABD are each of them right angles ; EBC is an obtuse , and EBD an acute angle ;
and the line AB is a perpendicular to co . 13 . “ A term or boundary is the extremity
...
An acute angle is that which is less than a right angle . Thus the angles ABC ,
ABD are each of them right angles ; EBC is an obtuse , and EBD an acute angle ;
and the line AB is a perpendicular to co . 13 . “ A term or boundary is the extremity
...
Σελίδα 11
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 , these straight
lines , being continually produced , shall at length meet upon that side on which
are ...
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 , these straight
lines , being continually produced , shall at length meet upon that side on which
are ...
Σελίδα 12
the words Let and Then ; and in the Demonstrations the successive steps will be
numbered , and their object , in less obvious cases , pointed out . Some few
propositions require no construction ; and in others the construction is mixed up
with ...
the words Let and Then ; and in the Demonstrations the successive steps will be
numbered , and their object , in less obvious cases , pointed out . Some few
propositions require no construction ; and in others the construction is mixed up
with ...
Σελίδα 14
To describe an isosceles triangle upon a given finite straight line , which shall be
less than either of the equal sides . Part . Enun . — Let all be the gn . st . line ;
then it is required to describe upon it an isosc . K E H A , of which the two = sides
...
To describe an isosceles triangle upon a given finite straight line , which shall be
less than either of the equal sides . Part . Enun . — Let all be the gn . st . line ;
then it is required to describe upon it an isosc . K E H A , of which the two = sides
...
Σελίδα 16
A link in the scientific chain is thereby broken ; and the system is of course
incomplete . PROP . III . PROB . C / ACE B GEN . ENUN . - From the greater of
two given straight lines to cut off a part equal to the less . PART . ENUN . — Let
AB and c ...
A link in the scientific chain is thereby broken ; and the system is of course
incomplete . PROP . III . PROB . C / ACE B GEN . ENUN . - From the greater of
two given straight lines to cut off a part equal to the less . PART . ENUN . — Let
AB and c ...
Τι λένε οι χρήστες - Σύνταξη κριτικής
Δεν εντοπίσαμε κριτικές στις συνήθεις τοποθεσίες.
Συχνά εμφανιζόμενοι όροι και φράσεις
ABCD adjacent alternate applied base BC bisect called coincide common Const construction contained Deducible definition demonstration describe diam diameter divide draw Enun ENUN.-If ENUN.-Let ABC ENUN.—Let equal equilateral Euclid exterior extremity figure formed four given point greater Hence interior intersect isosceles join length less line drawn manner meet opposite sides parallel parallelogram position Post PROB produced proof Prop Proposition proved rectilineal remaining respectively right angles side ac square straight line student subtraction THEOR Theorem third trapezium triangle vertical Wherefore XXIX XXXI XXXII XXXIV
Δημοφιλή αποσπάσματα
Σελίδα 58 - 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 24 - Upon the same base, and on the same side of it, there cannot be two triangles, that have their sides which are terminated in one extremity of the base equal to one another, and likewise those which are terminated in the other extremity, equal to one another.
Σελίδα 34 - If, at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line.
Σελίδα 6 - 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 109 - If the square described upon one of the sides of a triangle, be equal to the squares described upon the other two sides of it; the angle contained by these two sides is a right angle.
Σελίδα 9 - Parallel straight lines are such as are in the same plane, and which being produced ever so far both ways, do not meet.
Σελίδα 99 - 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 49 - If, from the ends of the 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. Let...
Σελίδα 104 - In any right-angled triangle, the square which is described upon the side subtending the right angle, is equal to the squares described upon the sides which contain the right angle.
Σελίδα 6 - 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.