## 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 11

Of three sided figures, an equilateral triangle is that which has three equal

- XXV. . An isosceles triangle, is that which has only two

A scalene triangle, is that which has. O F E U C L I Do 'II ...

Of three sided figures, an equilateral triangle is that which has three equal

**sides**.- XXV. . An isosceles triangle, is that which has only two

**sides**equal. * /\/\!/ XXVI.A scalene triangle, is that which has. O F E U C L I Do 'II ...

Side 12

A scalene triangle, is that which has three unequal

triangle, is that which has a right angle. XXVIII. An obtuse angled triangle, is that

which has an obtuse angle. 2127 A XXIX. An acute angled triangle, is that which

...

A scalene triangle, is that which has three unequal

**sides**. XXVII. A right angledtriangle, is that which has a right angle. XXVIII. An obtuse angled triangle, is that

which has an obtuse angle. 2127 A XXIX. An acute angled triangle, is that which

...

Side 16

T H E O R.E.M. F two triangles have two fides of the one equal to two fides of the

other, each to each; and have likewise the angles contained by those fides equal

to one another; they shall likewie have their bases, or third

T H E O R.E.M. F two triangles have two fides of the one equal to two fides of the

other, each to each; and have likewise the angles contained by those fides equal

to one another; they shall likewie have their bases, or third

**sides**, equal; and the ... Side 18

Because AF is equal to AG, and AB to AC; the two

two GA, AB, each to each ; and they contain the angle FAG common to the two

triangles AFC, A AGB ; therefore the base FC is equal * to the base GB, and the ...

Because AF is equal to AG, and AB to AC; the two

**sides**FA, AC are equal to thetwo GA, AB, each to each ; and they contain the angle FAG common to the two

triangles AFC, A AGB ; therefore the base FC is equal * to the base GB, and the ...

Side 20

... BCD, which is impossible. The case in which the vertex of one triangle is upon

a

on the same fide of it, there cannot be two triangles that have their

... BCD, which is impossible. The case in which the vertex of one triangle is upon

a

**side**of the other needs no demonstration. Therefore upon the same base, andon the same fide of it, there cannot be two triangles that have their

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### Andre utgaver - Vis alle

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

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### 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.