## 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 |

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Page 39

THE opposite sides and angles of parallelograms are equal to one another , and

the

parallelogram is a four sided figure , of which the opposite sides are parallel ; and

...

THE opposite sides and angles of parallelograms are equal to one another , and

the

**diameter**bisects them , that is , divides them into two equal parts . N. B. Aparallelogram is a four sided figure , of which the opposite sides are parallel ; and

...

Page 45

THE complements of the parallelograms which are about the

parallelogram , are equal to one another . Let ABCD be a parallelogram , of

which the

...

THE complements of the parallelograms which are about the

**diameter**of anyparallelogram , are equal to one another . Let ABCD be a parallelogram , of

which the

**diameter**is AC and EH , FG the parallelograms A H D about AC , that is...

Page 183

ABCD and AEFG are about the same

A G D parallelogram BD bave its

from AF , the

and ...

ABCD and AEFG are about the same

**diameter**. For , if not , let , if possible , theA G D parallelogram BD bave its

**diameter**AHC in a different straight K H linefrom AF , the

**diameter**of the parallelogram EG , and let GF E F meet AHC in H ;and ...

Page 265

Join BD , EC , CD ; and because ABED is a parallelogram of which BD is the

pyramid of which the base is the triangle ABD , and vertex the point C , is equal b

to ...

Join BD , EC , CD ; and because ABED is a parallelogram of which BD is the

**diameter**, the triangle ABD is equal a to a 34. 1 . the triangle EBD ; therefore thepyramid of which the base is the triangle ABD , and vertex the point C , is equal b

to ...

Page 272

Let the cones and cylinders , of which the bases are the circles ABCD , EFGH ,

and the axes KL , MN , and AC , EG the

altitude . As the circle ABCD to the circle EFGH , so is the cone AL to the cone EN

.

Let the cones and cylinders , of which the bases are the circles ABCD , EFGH ,

and the axes KL , MN , and AC , EG the

**diameters**of their bases , be of the samealtitude . As the circle ABCD to the circle EFGH , so is the cone AL to the cone EN

.

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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.