## 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

Page 3

That , excepting a very few interpolations , explications , and additions , Theon altered nothing in Euclid . ” But , by often considering and comparing together the definitions and demonstrations as they are in the

That , excepting a very few interpolations , explications , and additions , Theon altered nothing in Euclid . ” But , by often considering and comparing together the definitions and demonstrations as they are in the

**Greek**editions we ... Page 82

And this is all that is to be understood , when , in the

And this is all that is to be understood , when , in the

**Greek**text and translations from it , the angle of the semicircle is said to be greater than any acute rectilineal angle , and the remaining angle less than any rectilineal angle ... Page 93

... ADC falls within the right angle CAF . " And this is all that is meant , when in the c 10 . a Book III . “

... ADC falls within the right angle CAF . " And this is all that is meant , when in the c 10 . a Book III . “

**Greek**text , and the translations OF EUCLID . 93. Page 94

“

“

**Greek**text , and the translations from it , the angle of the greater • segment is said to be greater , and the angle of the less segment • is said to be less , than a right angle . ' Cor . From this it is manifest , that if one angle ... Page 273

Vertex is put in place of altitude which is in the

Vertex is put in place of altitude which is in the

**Greek**, because the pyramid , in what follows , is supposed to be circumscribed about the cone , and so must have the same vertex . And the same change is made in some places fola ...### What people are saying - Write a review

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### 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 radius reason rectangle rectangle contained rectilineal figure 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.