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Περιεχόμενα

 EUCLIDS PROPOSITIONS XXVII AND XXVIII 45 MISCELLANEOUS EXERCISES ON SECTIONS I AND II 56 Note 6 57 INTRODUCTORY REMARKS 77 EUCLIDS PROPOSITION VII 80 Euclids PROPOSITIONS I TO VI 84 EUCLIDS PROPOSITIONS VII TO XIV 93 EUCLIDS PROPOSITIONS VI TO X 129 PROPOSITION B EUCL IV 135
 EUCL VI 225 ON PROPORTION BY INVERSION ALTERNATION 227 EUCL V 233 EUCL VI 238 MISCELLANEOUS EXERCISES ON BOOK VI 289 EUCLIDS ELEMENTSBOOK XI 296 102 304 INTRODUCTORY REMARKS 307 LEMMA 337

Δημοφιλή αποσπάσματα

Σελίδα 52 - If a side of any triangle be produced, the exterior angle is equal to the two interior and opposite angles; and the three interior angles of every triangle are together equal to two right angles.
Σελίδα 17 - 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.
Σελίδα 167 - 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 69 - The complements of the parallelograms which are about the diameter of any parallelogram, are equal to one another. Let ABCD be a parallelogram, of which the diameter is AC...
Σελίδα 106 - To draw a straight line through a given point parallel to a given straight line. Let A be the given point, and BC the given straight line ; it is required to draw a straight line through the point A, parallel to the straight hue BC.
Σελίδα 88 - If a straight line be bisected, and produced to any point, the square on the whole line thus produced, and the square on the part of it produced, are together double of the square on half the line bisected; and of the square on the line made up of the half and the part produced. Let the straight line AB be bisected in C, and produced to the point D. Then the squares on AD, DB, shall be double of the squares on AC, CD.
Σελίδα 78 - If there be two straight lines, one of which is divided into any number of parts, the rectangle contained by the two straight lines is equal to the rectangles contained by the undivided line, and the several parts of the divided line.
Σελίδα 91 - 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 acute angle and the perpendicular let fall upon it from the opposite angle, Let ABC be any triangle, and the angle at B one of its acute angles, and upon BC, one of the sides containing it, let fall the perpendicular AD from the opposite angle.
Σελίδα 5 - 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 5 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.