## Elements of Geometry: Containing the First Six Books of Euclid, with a Supplement on the Quadrature of the Circle, and the Geometry of Solids; to which are Added Elements of Plane and Spherical Trigonometry |

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Side 40

If two lines KL and CD make , with EF , the two angles KGH , GHC together less

than twò right angles , KG and CH will

angles are that are less than two right angles . For , if not , KL and CD are either ...

If two lines KL and CD make , with EF , the two angles KGH , GHC together less

than twò right angles , KG and CH will

**meet**on the side of EF on which the twoangles are that are less than two right angles . For , if not , KL and CD are either ...

Side 183

Now AG is any straight line drawn in the plane of the lines AD , AF ; and when a

straight line is at right angles to any straight line which it

is at right angles to the plane itself ( def . 1 . 2. Sup . ) . AB is therefore at right ...

Now AG is any straight line drawn in the plane of the lines AD , AF ; and when a

straight line is at right angles to any straight line which it

**meets**with in a plane , itis at right angles to the plane itself ( def . 1 . 2. Sup . ) . AB is therefore at right ...

Side 187

But DAE , which is in that plane ,

not , they must

must be a straight line GH , in G which take any point K , and join AK , BK : Then ...

But DAE , which is in that plane ,

**meets**B CA ; therefore CAE is a right angle . ... Ifnot , they must

**meet**one another when produced , and their common sectionmust be a straight line GH , in G which take any point K , and join AK , BK : Then ...

Side 300

In order to demonstrate this proposition , Euclid assumed it as an Axiom , that “ if

a straight line

same side of it less than “ two right angles , these straight lines being continually

...

In order to demonstrate this proposition , Euclid assumed it as an Axiom , that “ if

a straight line

**meet**two straight lines , so as to make the interior angles on thesame side of it less than “ two right angles , these straight lines being continually

...

Side 302

That two straight lines which do not

angles with any third line that

propositions is not at all facilitated by the new definition , unless it be previously ...

That two straight lines which do not

**meet**when produced , must make equalangles with any third line that

**meets**them . The demonstration of the first of thesepropositions is not at all facilitated by the new definition , unless it be previously ...

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Elements of Geometry: Containing the First Six Books of Euclid: With a ... John Playfair Uten tilgangsbegrensning - 1819 |

Elements of Geometry: Containing the First Six Books of Euclid, with a ... John Playfair Uten tilgangsbegrensning - 1824 |

### Vanlige uttrykk og setninger

ABCD altitude angle ABC angle BAC arch base bisected Book called centre circle circle ABC circumference coincide common contained cosine cylinder definition demonstrated described diameter difference divided double draw drawn equal equal angles equiangular Euclid exterior extremity fall fore four fourth given given straight line greater half inscribed interior join less Let ABC magnitudes manner meet multiple opposite parallel parallelogram pass perpendicular plane polygon prism produced proportionals proposition proved Q. E. D. PROP radius ratio reason rectangle contained rectilineal figure right angles segment shewn sides similar sine solid square straight line taken tangent THEOR thing third touches triangle ABC wherefore whole

### Populære avsnitt

Side 56 - 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 19 - 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.

Side 33 - THE greater angle of every triangle is subtended by the greater side, or has the greater side opposite to it.

Side 62 - In every triangle, the square on the side subtending either of the acute angles, is less than the squares on the sides containing that angle, by twice the rectangle contained by either of these sides, and the straight line intercepted between the...

Side 62 - In obtuse-angled triangles, if a perpendicular be drawn from either of the acute angles to the opposite side produced, the square of the side subtending the obtuse angle, is greater than the squares of the sides containing the obtuse angle, by twice the rectangle contained by the side upon which, when produced, the perpendicular falls, and the straight line intercepted without the triangle, between the perpendicular and the obtuse angle. Let ABC be an obtuse-angled triangle, having the obtuse angle...

Side 130 - 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 76 - THE diameter is the greatest straight line in a circle; and, of all others, that which is nearer to the centre is always greater than one more remote ; and the greater is nearer to the centre than the less.* Let ABCD be a circle, of which...

Side 36 - IF two triangles have two sides of the one equal to two sides of the other, each to each, but the angle contained by the two sides of one of them greater than the angle contained by the two sides equal to them, of the other ; the base of that which has the greater angle shall be greater than the base of the other.

Side 18 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it.

Side 55 - If a straight line be divided into any two parts, the rectangle contained by the whole and one of the parts, is equal to the rectangle contained by the two parts, together with the square of the aforesaid part.