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 17.
Σελίδα 9
The whole triangle ABC shall coincide with the whole triangle DEF and be equal
to it ; and the other angles of the one shall coincide with the remaining angles of
the other , and be equal to them , viz . 6 . The angle ABC shall be equal to the ...
The whole triangle ABC shall coincide with the whole triangle DEF and be equal
to it ; and the other angles of the one shall coincide with the remaining angles of
the other , and be equal to them , viz . 6 . The angle ABC shall be equal to the ...
Σελίδα 10
The triangles BFC , CGB , are equal , and their remaining angles are equal , each
to each , to which the equal sides are opposite ; therefore • 5 . The angle FBC is
equal to the angle GCB , and the angle BCF to the angle CBG . And since it has ...
The triangles BFC , CGB , are equal , and their remaining angles are equal , each
to each , to which the equal sides are opposite ; therefore • 5 . The angle FBC is
equal to the angle GCB , and the angle BCF to the angle CBG . And since it has ...
Σελίδα 18
The angles CBA , ABE , are equal to the angles CBA , ABD . Take away the
common angle ABC , and ( Ax . 3 . ) 3 . The remaining angle ABE is equal to the
remaining angle ABD , the less to the greater , which is impossible ; therefore 4 .
The angles CBA , ABE , are equal to the angles CBA , ABD . Take away the
common angle ABC , and ( Ax . 3 . ) 3 . The remaining angle ABE is equal to the
remaining angle ABD , the less to the greater , which is impossible ; therefore 4 .
Σελίδα 19
Take away the common angle AED , and ( Ax . 3 . ) 4 . The remaining angle CEA
is equal to the remaining angle DEB . In the same manner it can be demonstrated
that 5 . The angles CEB , AED , are equal . Therefore , if two straight lines , & c .
Take away the common angle AED , and ( Ax . 3 . ) 4 . The remaining angle CEA
is equal to the remaining angle DEB . In the same manner it can be demonstrated
that 5 . The angles CEB , AED , are equal . Therefore , if two straight lines , & c .
Σελίδα 29
to two right angles , and that AGH , BGH , are also equal ( I . 13 . ) to two right
angles , 1 . The angles AGH , BGH , are equal to the angles BGH , GHD . Take
away the common angle BGH ; therefore 2 . The remaining angle AGH is equal to
the ...
to two right angles , and that AGH , BGH , are also equal ( I . 13 . ) to two right
angles , 1 . The angles AGH , BGH , are equal to the angles BGH , GHD . Take
away the common angle BGH ; therefore 2 . The remaining angle AGH is equal to
the ...
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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...