## 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 34

Ax . therefore the

& c . Q. E. D. PROP . XXXVIII . THEOR . TRIANGLEs upon equal bases , and

between the same parallels , are equal to one another . Let the

DEF ...

Ax . therefore the

**triangle ABC**is equal to the triangle DBC . Wherefore triangles ,& c . Q. E. D. PROP . XXXVIII . THEOR . TRIANGLEs upon equal bases , and

between the same parallels , are equal to one another . Let the

**triangles ABC**,DEF ...

Page 148

... TRIANGLES and parallelograms of the same altitude are one to another as

their bases . r Let the

CF.

... TRIANGLES and parallelograms of the same altitude are one to another as

their bases . r Let the

**triangles ABC**, ACD ... BC is to the base CD , so is the**triangle ABC**to the triangle ACD , and the parallelogram EC to the parallelogramCF.

Page 163

Let the triangles be placed so that their fides CA , AD be in one straight line ;

wherefore also EA and AB are in one straight linea ; 2. sa . 1 . and join BD .

Because the

triangle ...

Let the triangles be placed so that their fides CA , AD be in one straight line ;

wherefore also EA and AB are in one straight linea ; 2. sa . 1 . and join BD .

Because the

**triangle ABC**is equal to the triangle ADE , and that ABD is anothertriangle ...

Page 418

TF a triangle has a given obtuse angle ; the excess of the square of the fide which

subtends the obtuse angle above the squares of the sides which contain it , shall

have a given ratio to the triangle . Let the

TF a triangle has a given obtuse angle ; the excess of the square of the fide which

subtends the obtuse angle above the squares of the sides which contain it , shall

have a given ratio to the triangle . Let the

**triangle ABC**have a given obtuse ... Page 425

POQ . therefore the

the

AC to the square of BC be given ; the

...

POQ . therefore the

**triangle ABC**is similar to the triangle POQ . Otherwise , Letthe

**triangle ABC**have the given angle BAC , and let the ratio of the rectangle BA ,AC to the square of BC be given ; the

**triangle ABC**is given in species . Because...

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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.