## 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 9

Ax .

Ax .

**fore**the base BC shall coincide with the base EF , and be equal to it . Wherefore the whole triangle ABC Mall coincide with the whole triangle DEF , and be equal to it ; and the other angles of the one shall coincide with the ... Page 33

33. to

33. to

**fore**EB , CH are both equal and parallel , and EBCH is a parallelogram ; and it is equal to ABCD , because it is upon the same base c . 15. to BC , and between the fame parallels BC , AD . for the like reason ... Page 42

... is equalb to the squares of DA , A AC , because DAC is a right angle ; and the square of BC , by Hypothesis , is equal to the squares of BA , AC ; therefore the square of DC is equal to the square of BC ; and thereB С

... is equalb to the squares of DA , A AC , because DAC is a right angle ; and the square of BC , by Hypothesis , is equal to the squares of BA , AC ; therefore the square of DC is equal to the square of BC ; and thereB С

**fore**also the ... Page 48

CH is equal to HF ; thereA С B D

CH is equal to HF ; thereA С B D

**fore**also AL is equal to HF . to each of these add CM , L Н. therefore the whole AM is eM qual to the gnomon CMG . K and AM is the rectangle contained by AD , DB , for DM is e . Cor . 4. Page 53

... and that the angle at F is a E E F right angle , because it is equal to the opposite h . 34. 1 angle ECD , the remaining angle FEG is half A a right angle , and equal to the angle EGF ; whereG

... and that the angle at F is a E E F right angle , because it is equal to the opposite h . 34. 1 angle ECD , the remaining angle FEG is half A a right angle , and equal to the angle EGF ; whereG

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### Common terms and phrases

added alſo altitude angle ABC angle BAC baſe BC is given becauſe Book caſe circle circle ABCD circumference common cone contained 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 BC 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.