## 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 38

1 . gether with

with

sides . Cor . 2. All the exterior angles of any rectilineal figure , are together equal

to ...

1 . gether with

**four**right angles . Therefore all the angles of the figure , togetherwith

**four**right angles , are equal to twice as many right angles as the figure hassides . Cor . 2. All the exterior angles of any rectilineal figure , are together equal

to ...

Page 58

RN , because they are the complements of the parallelogram CO ; therefore also

BN is equal to GR ; and the

to one another , and so are quadruple of one of them CK : again , because CB ...

RN , because they are the complements of the parallelogram CO ; therefore also

BN is equal to GR ; and the

**four**rectangles BN , CK , GR , RN are therefore equalto one another , and so are quadruple of one of them CK : again , because CB ...

Page 121

Permutando , or alternando , by permutation , or alternately ; this word is used

when there are

same ratio to the third , which the second has to the fourth ; or that the first is to

the ...

Permutando , or alternando , by permutation , or alternately ; this word is used

when there are

**four**proportionals , and it is See N. inferred , that the first has thesame ratio to the third , which the second has to the fourth ; or that the first is to

the ...

Page 193

... there are

sectors BGC , EHF , and of the circumference BC , and sector BGC , the

circumference BL and sector BGL are any equal multiples whatever ; and of the

circumference ...

... there are

**four**magnitudes , the two circumferences BC , EF , and the twosectors BGC , EHF , and of the circumference BC , and sector BGC , the

circumference BL and sector BGL are any equal multiples whatever ; and of the

circumference ...

Page 217

ABC , DEF , GHK are equal to

less than

but nei- M N ther can AB be less than LX : for , if possible , let it be less , and upon

...

ABC , DEF , GHK are equal to

**four**right angles : but , by the hypothesis , they areless than

**four**right anX gles ; which is absurd ; therefore AB is not equal to LX :but nei- M N ther can AB be less than LX : for , if possible , let it be less , and upon

...

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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.