## The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago Vitiated These Books, are Corrected, and Some of Euclid's Demonstrations are Restored. Also, The Book of Euclid's Data, in Like Manner Corrected. viz. the first six books, together with the eleventh and twelfthMathew Carey, and sold by J. Conrad & Company, S. F. Bradford, Birch & Small, and Samuel Etheridge. Printed by T. & G. Palmer, 116, High-Street., 1806 - Trigonometry - 518 pages |

### From inside the book

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Page 27

these add the angle ACB ; therefore the angles ACD , ACB are Book I. greater

than the

; therefore the

these add the angle ACB ; therefore the angles ACD , ACB are Book I. greater

than the

**angles ABC**, ACB ; but ACD , ACB are together equal to two right angles; therefore the

**angles ABC**, b 13. 1 . BCA are less than two right angles . Page 104

Let ABC be the given circle , and DEF the given triangle ; it is required to inscribe

in the circle ABC a triangle ... HAC is equalc to the

segment of the circle : but HAC is equal to the angle DEF ; therefore also the

angle ...

Let ABC be the given circle , and DEF the given triangle ; it is required to inscribe

in the circle ABC a triangle ... HAC is equalc to the

**angle ABC**in the alternatesegment of the circle : but HAC is equal to the angle DEF ; therefore also the

angle ...

Page 162

IF the sides of two triangles , about each of their angles , be proportionals , the

triangles shall be equiangular , and have ... At the points E , F , in the straight line

EF , make a the angle FEG equal to the

...

IF the sides of two triangles , about each of their angles , be proportionals , the

triangles shall be equiangular , and have ... At the points E , F , in the straight line

EF , make a the angle FEG equal to the

**angle ABC**, and the angle EFG equal to...

Page 217

For the same d 8 1 . reason , the angle DEF is equal to the angle MXN , and the

angle GHK to the angle NXL ; therefore the three

equal to the three angles LXM , MXN , NXL : but the three angles LXM , MXN ...

For the same d 8 1 . reason , the angle DEF is equal to the angle MXN , and the

angle GHK to the angle NXL ; therefore the three

**angles ABC**, R DEF , GHK areequal to the three angles LXM , MXN , NXL : but the three angles LXM , MXN ...

Page 426

PROP . LXXIV . IF a triangle has a given obtuse

of the side which subtends the obtuse

which contain it , shall have a given ratio to the triangle . Let the triangle

have a ...

PROP . LXXIV . IF a triangle has a given obtuse

**angle**; the excess of the squareof the side which subtends the obtuse

**angle**, above the squares of the sideswhich contain it , shall have a given ratio to the triangle . Let the triangle

**ABC**have a ...

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The Elements of Euclid, Viz: The Errors, by Which Theon, Or Others, Have ... Robert Simson,Robert Euclid No preview available - 2018 |

The Elements of Euclid, Viz: The Errors, by Which Theon, Or Others, Have ... Robert Simson,Robert Euclid No preview available - 2015 |

The Elements of Euclid: Viz. The First Six Books, Together With the Eleventh ... Robert Simson No preview available - 2017 |

### Common terms and phrases

ABCD added altitude angle ABC angle BAC base Book centre circle circle ABC circumference common cone cylinder definition demonstrated described diameter divided double draw drawn equal equal angles equiangular equimultiples excess fore four fourth given angle given in position given in species given magnitude given ratio given straight line greater Greek half join less likewise magnitude manner meet multiple opposite parallel parallelogram pass perpendicular plane prisms produced PROP proportionals proposition pyramid Q. E. D. PROP radius reason rectangle rectangle contained remaining right angles segment shown sides similar sine solid solid angle sphere square square of AC taken THEOR third triangle ABC wherefore whole

### Popular passages

Page 30 - Any two sides of a triangle are together greater than the third side.

Page 64 - 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.

Page 30 - 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...

Page 59 - PROP. VIII. THEOR. IF a straight line be divided into any two parts, tour times the rectangle contained by the whole line, and one of the parts, together with the square of the other part, is equal to the square of the straight line which is made up of the whole and that part.

Page 28 - If one side of a triangle be produced, the exterior angle is greater than either of the interior opposite angles.

Page 165 - If two triangles have one angle of the one equal to one angle of the other and the sides about these equal angles proportional, the triangles are similar.

Page 19 - THE angles at the base of an isosceles triangle are equal to one another : and, if the equal sides be produced, the angles upon the other side of the base shall be equal.

Page 191 - In right angled triangles, the rectilineal figure described upon the side opposite to the right angle, is equal to the similar, and similarly described figures upon the sides containing the right angle.

Page 39 - 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 sidef. For any rectilineal figure ABCDE can be divided into as many triangles as the figure has sides, by drawing straight lines from a point F within the figure to each of its angles.

Page 180 - Therefore, universally, similar rectilineal figures are to one another in the duplicate ratio of their homologous sides.