## 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 381

IF F a straight line be drawn to a given point in a given straight line , and makes a

given in position , and C a given point in it , the straight line drawn to C which ...

IF F a straight line be drawn to a given point in a given straight line , and makes a

**given angle**with it . that straight line is given in polition . Let AB be a straight linegiven in position , and C a given point in it , the straight line drawn to C which ...

Page 384

and if G be equal to HK , EF alfo is equal to it ; wherefore EF is at right angles to

CD , for if it be not , EF would be greater than HK , which is absurd . therefore the

angle EFD is a right and consequently a

...

and if G be equal to HK , EF alfo is equal to it ; wherefore EF is at right angles to

CD , for if it be not , EF would be greater than HK , which is absurd . therefore the

angle EFD is a right and consequently a

**given angle**. But if the straight line 6 be...

Page 392

PRO P. XLVII , See N. IF Fa triangle has one of its

another ; the triangle is

PRO P. XLVII , See N. IF Fa triangle has one of its

**angles**which is not a right**angle given**, and if the sides about another**angle**have a**given**ratio to oneanother ; the triangle is

**given**in species . Let the triangle ABC have one of its**angles**ABC ... Page 412

See N. F the sides of two parallelograms which have unequal , but

, have given ratios to one another ; the ... At the point B of the fraight line BC make

the angle CIK equal to the

See N. F the sides of two parallelograms which have unequal , but

**given**,**angles**, have given ratios to one another ; the ... At the point B of the fraight line BC make

the angle CIK equal to the

**given angle**EFG , and complete the parallelogram ... Page 426

Describe the circle BAC about the triangle , and from its center E draw EA , EB ,

EC , ED . because the

which is the double b of it , is

Describe the circle BAC about the triangle , and from its center E draw EA , EB ,

EC , ED . because the

**angle**BAC is**given**, b . 20. 3. the**angle**BEC at the center ,which is the double b of it , is

**given**. 1 and the ratio of BE to EC is**given**...### What people are saying - Write a review

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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.