## 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, to this Second Edition is Added the Book of Euclid's Data. In Like Manner Corrected. viz. the first six books, together with the eleventh and twelfth |

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Page 7

BCD , and from the center B , at the distance BA describe the circle D ACE ; and

from the point C in B E which the circles cut one another

CA , CB b . 2d Post . to the points A , B. ABC shall be an equilateral triangle .

BCD , and from the center B , at the distance BA describe the circle D ACE ; and

from the point C in B E which the circles cut one another

**draw**the straight lines 6CA , CB b . 2d Post . to the points A , B. ABC shall be an equilateral triangle .

Page 75

is required to

Find a the center E of the circle , and join AE ; and from the cen- a . 1. 3 . ter E , at

the di canci E describe the circle AFG ; from the point D

...

is required to

**draw**a straight line from A which shall touch the Book III . circle .Find a the center E of the circle , and join AE ; and from the cen- a . 1. 3 . ter E , at

the di canci E describe the circle AFG ; from the point D

**draw**DF at right angles to...

Page 159

From the point A

take any point D , and take AC which is the same multiple of AD that AB is of the

part which is to be cut off from it ; join BC , and

...

From the point A

**draw**a straight line AC making any angle with AB ; and in ACtake any point D , and take AC which is the same multiple of AD that AB is of the

part which is to be cut off from it ; join BC , and

**draw**А DE parallel to it . then AE is...

Page 198

To

A be the given point above the plane BH ; it is required to

straight line perpendicular to the plane BH . In the plane

To

**draw**a straight line perpendicular to a plane , from a given point above it . LetA be the given point above the plane BH ; it is required to

**draw**from the point A astraight line perpendicular to the plane BH . In the plane

**draw**any straight line ... Page 422

BAC ;

angle EGF is equal to the angle BAC , and that EGF is an Isosceles triangle and

ABC is not , the angle FEG is not equal to the angle CBA .

angle ...

BAC ;

**draw**GH bisecting EF at right angles , and join EG , GF . then since theangle EGF is equal to the angle BAC , and that EGF is an Isosceles triangle and

ABC is not , the angle FEG is not equal to the angle CBA .

**draw**EL making theangle ...

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### Common terms and phrases

added alſo altitude angle ABC angle BAC baſe BC is given becauſe Book Book XI caſe circle circle ABCD circumference common cone cylinder Definition demonſtrated deſcribed diameter divided double draw drawn equal equal angles equiangular equimultiples exceſs fame fides firſt folid 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 muſt oppoſite parallel parallelogram perpendicular plane priſm produced PROP proportionals Propoſition pyramid reaſon rectangle remaining right angles ſame ſecond ſegment ſhall ſhewn ſides ſimilar ſolid ſquare ſquare of AC taken THEOR theſe third thro triangle ABC wherefore whole

### Popular passages

Page 5 - Let it be granted that a straight line may be drawn from any one point to any other point.

Page 163 - 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 48 - If a straight line be divided into any two parts, the squares of the whole line, and of one of the parts, are equal to twice the rectangle contained by the whole and that part, together with the square of the other part. Let the straight line AB be divided into any two parts in the point C; the squares of AB, BC are equal to twice the rectangle AB, BC, together with the square of AC.

Page 73 - The straight line drawn at right angles to the diameter of a circle, from the extremity of it, falls without the circle; and no straight line can be drawn from the extremity between that straight line and the circumference, so as not to cut the circle...

Page 105 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz. either the sides adjacent to the equal...

Page 3 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.

Page 167 - Similar triangles are to one another in the duplicate ratio of their homologous sides.

Page 54 - AB be the given straight line ; it is required to divide it into two parts, so that the rectangle contained by the whole, and one of the parts, shall be equal to the square of the other part.

Page 47 - If a straight line be divided into two equal parts, and also into two unequal parts; the rectangle contained by the unequal parts, together with the square of the line between the points of section, is equal to the square of half the line.

Page 37 - To describe a parallelogram that shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.