Euclid's Elements of geometry, books i. ii. iii. iv1862 |
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Página 3
... equal . 32. A rhombus is that which has all its sides equal , but its angles are not right angles . 33. A rhomboid is that which has its opposite sides equal to one another , but all its sides are not equal , nor its angles right angles ...
... equal . 32. A rhombus is that which has all its sides equal , but its angles are not right angles . 33. A rhomboid is that which has its opposite sides equal to one another , but all its sides are not equal , nor its angles right angles ...
Página 4
Euclides. AXIOMS . 1. Things which are equal to the same thing are equal to one another . 2. If equals be added to equals the wholes are equal . 3. If equals be taken from equals the remainders are equal . 4. If equals be added to ...
Euclides. AXIOMS . 1. Things which are equal to the same thing are equal to one another . 2. If equals be added to equals the wholes are equal . 3. If equals be taken from equals the remainders are equal . 4. If equals be added to ...
Página 5
... equal to AB . ( def . 15. ) 2. Because the point B is the centre of the circle ACE , BC is equal to BA . ( def . 15. ) 3. Therefore AC and BC are each of them equal to AB . 4. But things which are equal to the same thing are equal to ...
... equal to AB . ( def . 15. ) 2. Because the point B is the centre of the circle ACE , BC is equal to BA . ( def . 15. ) 3. Therefore AC and BC are each of them equal to AB . 4. But things which are equal to the same thing are equal to ...
Página 6
... equal to BC . Proof . - 1 . Because the point B is the centre of the circle CGH , BC is equal to BG . ( def . 15. ) 2. Because the point D is the centre of the circle GKL , DL is equal to DG . ( def . 15. ) K H D B E G 3. But DA , DB ...
... equal to BC . Proof . - 1 . Because the point B is the centre of the circle CGH , BC is equal to BG . ( def . 15. ) 2. Because the point D is the centre of the circle GKL , DL is equal to DG . ( def . 15. ) K H D B E G 3. But DA , DB ...
Página 7
... equal to AD . 4. Therefore AE is equal to C. ( ax . 1. ) Conclusion . - Therefore , from AB , the greater of two given straight lines , a part AE has been cut off , equal to C , the less . Q. E. F * PROPOSITION 4. - THEOREM . If two ...
... equal to AD . 4. Therefore AE is equal to C. ( ax . 1. ) Conclusion . - Therefore , from AB , the greater of two given straight lines , a part AE has been cut off , equal to C , the less . Q. E. F * PROPOSITION 4. - THEOREM . If two ...
Términos y frases comunes
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
Pasajes populares
Página 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.
Página 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.
Página 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.
Página 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...
Página 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...
Página 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.
Página 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.
Página 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...
Página 88 - The straight line drawn at right angles to the diameter of a circle, from the extremity of it, falls without the circle...
Página 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.