## The Elements of Euclid, Viz: 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. the first six books, together with the eleventh and twelfth |

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Side 16

It is required to cut off from AB, the greater, a part equal to C the

point A draw "the straight line AD equal to C ; and from the centre A, and at the

distance AD, describe b the circle DEF; and because A is the center of the circle

DEF ...

It is required to cut off from AB, the greater, a part equal to C the

**less**. From thepoint A draw "the straight line AD equal to C ; and from the centre A, and at the

distance AD, describe b the circle DEF; and because A is the center of the circle

DEF ...

Side 27

CA are

BAC, ACB, as also CAB, ABC are

angles, &c. Q. E. D. P R o P. xviii. T H E O R. THE greater fide of every triangle is

...

CA are

**less**than two right angles. In like manner, it may be demonstrated thatBAC, ACB, as also CAB, ABC are

**less**than two right angles. Therefore any twoangles, &c. Q. E. D. P R o P. xviii. T H E O R. THE greater fide of every triangle is

...

Side 28

ABC would be

is not

See N. that it is not equal to AB; therefore AC is greater than AB. Wherefore the ...

ABC would be

**less**" than the angle ACB; but it is not; there. \ovo-J fore the fide ACis not

**less**than AB; and it has been shewn b 18, 1. See Ne • ?: 1. $ 5. I. C 19. r.See N. that it is not equal to AB; therefore AC is greater than AB. Wherefore the ...

Side 32

For, if it be not greater, it must either be equal to it, or

not equal to the angle EDF, because then the base BC would be equal" A. D to

EF; but it is not; therefore the angle BAC is not equal to the angle EDF; neither is

it ...

For, if it be not greater, it must either be equal to it, or

**less**; but the angle BAC isnot equal to the angle EDF, because then the base BC would be equal" A. D to

EF; but it is not; therefore the angle BAC is not equal to the angle EDF; neither is

it ...

Side 43

... triangle BDC is equal to the triangle EBC, the greater to the

impossible: Therefore AE is not parallel to BC. In the same manner, it can be

demonstrated B C that no other line but AD is parallel to BC ; AD is therefore

parallel to it.

... triangle BDC is equal to the triangle EBC, the greater to the

**less**, which isimpossible: Therefore AE is not parallel to BC. In the same manner, it can be

demonstrated B C that no other line but AD is parallel to BC ; AD is therefore

parallel to it.

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The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ... Robert Simson Uten tilgangsbegrensning - 1762 |

The Elements of Euclid: The Errors by which Theon, Or Others, Have Long ... Robert Simson Uten tilgangsbegrensning - 1827 |

The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ... Robert Simson Uten tilgangsbegrensning - 1781 |

### Vanlige uttrykk og setninger

added alſo altitude angle ABC angle BAC baſe becauſe Book Book XI caſe circle circle ABCD circumference common cone cylinder definition demonſtrated deſcribed diameter divided double draw drawn equal equiangular equimultiples exceſs fides figure firſt fore four fourth given angle given in poſition given in ſpecies given magnitude given ratio given ſtraight line greater half join leſs likewiſe magnitude manner meet muſt oppoſite P R O parallel parallelogram perpendicular plane produced prop proportionals propoſition pyramid reëtangle contained reëtilineal remaining right angles ſame ſame multiple ſecond ſegment ſhall ſhewn ſides ſimilar ſolid ſolid angle ſphere ſquare ſquare of AC T H E O Take taken theſe third triangle ABC wherefore whole

### Populære avsnitt

Side 32 - 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...

Side 165 - D ; wherefore the remaining angle at C is equal to the remaining angle at F ; Therefore the triangle ABC is equiangular to the triangle DEF.

Side 170 - 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.

Side 10 - When several angles are at one point B, any ' one of them is expressed by three letters, of which ' the letter that is at the vertex of the angle, that is, at ' the point in which the straight lines that contain the ' angle meet one another, is put between the other two ' letters, and one of these two is...

Side 55 - 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.

Side 32 - ... then shall the other sides be equal, each to each; and also the third angle of the one to the third angle of the other. Let ABC, DEF be two triangles which have the angles ABC, BCA equal to the angles DEF, EFD, viz.

Side 45 - To describe a parallelogram that shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.

Side 211 - AB shall be at right angles to the plane CK. Let any plane DE pass through AB, and let CE be the common section of the planes DE, CK ; take any point F in CE, from which draw FG in the plane DE at right D angles to CE ; and because AB is , perpendicular to the plane CK, therefore it is also perpendicular to every straight line in that plane meeting it (3.

Side 38 - F, which is the common vertex of the triangles ; that is, together with four right angles. Therefore all the angles of the figure, together with four right angles, are equal to twice as many right angles as the figure has sides.

Side 304 - Thus, if B be the extremity of the line AB, or the common extremity of the two lines AB, KB, this extremity is called a point, and has no length : For if it have any, this length must either be part of the length of the line AB, or of the line KB.