Euclid's Elements of geometry, books i. ii. iii. iv1862 |
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Αποτελέσματα 1 - 5 από τα 14.
Σελίδα 2
... semicircle is the figure contained by a diameter and the part of the circumference cut off by the diameter . 19. A segment of a circle is the figure contained by a straight line and the part of the circumference which it cuts off . 20 ...
... semicircle is the figure contained by a diameter and the part of the circumference cut off by the diameter . 19. A segment of a circle is the figure contained by a straight line and the part of the circumference which it cuts off . 20 ...
Σελίδα 67
... semicircle BHF ; 4. Produce DE to H , and join GH ; Then the square described upon EH shall be equal to the rectilineal figure A. Proof . - 1 . Because the straight line BF is divided into two equal parts in the point G , and into two ...
... semicircle BHF ; 4. Produce DE to H , and join GH ; Then the square described upon EH shall be equal to the rectilineal figure A. Proof . - 1 . Because the straight line BF is divided into two equal parts in the point G , and into two ...
Σελίδα 89
... semicircle . Construction . - Take F the centre of the circle ABCD ( III . 1 ) , and join BF , DF . Demonstration ... semicircle . Construction . - Draw AF to the centre , and produce it to C , and join CE . Demonstration . - 1 . Then ...
... semicircle . Construction . - Take F the centre of the circle ABCD ( III . 1 ) , and join BF , DF . Demonstration ... semicircle . Construction . - Draw AF to the centre , and produce it to C , and join CE . Demonstration . - 1 . Then ...
Σελίδα 90
... semicircle , the angles CAD , CED , are equal . 3. Therefore the whole angle BAD is equal to the whole angle BED . ( ax . 2. ) Conclusion . Therefore , the angles in the same segment , & c . Q. E. D. PROPOSITION 22. - THEOREM . The ...
... semicircle , the angles CAD , CED , are equal . 3. Therefore the whole angle BAD is equal to the whole angle BED . ( ax . 2. ) Conclusion . Therefore , the angles in the same segment , & c . Q. E. D. PROPOSITION 22. - THEOREM . The ...
Σελίδα 93
... semicircle ; 13. But if the angle ABD be less than the angle BAD , the centre E falls within the segment ABC , which is therefore greater than a semicircle . Conclusion . Therefore , a segment of a circle being given , the circle has ...
... semicircle ; 13. But if the angle ABD be less than the angle BAD , the centre E falls within the segment ABC , which is therefore greater than a semicircle . Conclusion . Therefore , a segment of a circle being given , the circle has ...
Συχνά εμφανιζόμενοι όροι και φράσεις
AB is equal AC and CB adjacent angles angle ABC angle AGH angle BAC angle BCD angle EAB angle EDF angle equal angles CBA base BC BC is equal bisected circle ABC circumference Conclusion Conclusion.-Therefore const Construction.-1 Demonstration.-1 describe the circle diameter double equal angles equal to CD equiangular exterior angle given circle given point given rectilineal angle given straight line Given.-Let ABCD gnomon greater Hypothesis inscribed interior and opposite isosceles triangle less opposite angle parallel to CD parallelogram perpendicular point F produced Q. E. D. PROPOSITION rectangle AB BC rectangle AE rectangle contained rectilineal figure References-Prop remaining angle required to describe right angles segment semicircle Sequence side BC square on AC straight line AC straight line drawn touches the circle triangle ABC triangle DEF twice the rectangle
Δημοφιλή αποσπάσματα
Σελίδα 25 - 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 2 - 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 99 - The angle in a semicircle is a right angle; the angle in a segment greater than a semicircle is less than a right angle; and the angle in a segment less than a semicircle is greater than a right angle.
Σελίδα 4 - 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...
Σελίδα 66 - ... 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...
Σελίδα 65 - To divide a given straight line into two parts, so that the rectangle contained by the whole, and one of the parts, may be equal to the square of the other part.
Σελίδα 32 - F, which is the common vertex of the triangles ; that is, together with four right angles. Therefore all the angles of the figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Σελίδα 58 - 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...
Σελίδα 88 - The straight line drawn at right angles to the diameter of a circle, from the extremity of it, falls without the circle...
Σελίδα 33 - The straight lines which join the extremities of two equal and parallel straight lines towards the same parts, are also themselves equal and parallel.