## 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

Results 1-5 of 5

Page 32

Book I. For , if it be not greater , it must either be equal to it , or less ; but the

equala to EF ; but A D it is not ; therefore the

...

Book I. For , if it be not greater , it must either be equal to it , or less ; but the

**angle****BAC**is not equal to the angle EDF , because then the base BC would 24. 1 . beequala to EF ; but A D it is not ; therefore the

**angle BAC**is not equal to the angle...

Page 93

1 , ABC , ACB ; therefore the

them is therefore a С right e angle : wherefore the angle E def . 1 . BAC in a

semicircle is a right angle . And because the two angles ABC , BAC of the triangle

...

1 , ABC , ACB ; therefore the

**angle BAC**is equal to the angle FAC , B and each ofthem is therefore a С right e angle : wherefore the angle E def . 1 . BAC in a

semicircle is a right angle . And because the two angles ABC , BAC of the triangle

...

Page 191

BA to AC as CD to DE , the triangle ABC is equiangular b to DCE : b 6.6 .

therefore the angle ABC is equal to the angle DCE : and the

proved to be equal to ACD : therefore the whole angle ACE is equal to the iwo

angles ABC ...

BA to AC as CD to DE , the triangle ABC is equiangular b to DCE : b 6.6 .

therefore the angle ABC is equal to the angle DCE : and the

**angle BAC**wasproved to be equal to ACD : therefore the whole angle ACE is equal to the iwo

angles ABC ...

Page 213

IF a solid angle be contained by three plane angles , See N. any two of them are

greater than the third . Let the solid angle at A be contained by the three plane

angles ...

IF a solid angle be contained by three plane angles , See N. any two of them are

greater than the third . Let the solid angle at A be contained by the three plane

**angles BAC**, CAD , DAB . Any two of them are greater than the third . If theangles ...

Page 433

shown , the ratio of AD to BC is the same with the ratio of ( HF 10 FL , that is , by

the construction , with the ratio of ) OR to PQ : and the

angle POQ ; therefore the triangle ABC is similarf to the triangle POQ . f 1. Cor .

shown , the ratio of AD to BC is the same with the ratio of ( HF 10 FL , that is , by

the construction , with the ratio of ) OR to PQ : and the

**angle BAC**is equal to theangle POQ ; therefore the triangle ABC is similarf to the triangle POQ . f 1. Cor .

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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.