## 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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Resultat 1-5 av 5

Side 78

Also it is evident that there can · be but one straight line which

in the same point . PROP . XVII . PROB . To draw a straight line from a given point

, either without or in the cir . cumference , which shall

Also it is evident that there can · be but one straight line which

**touches**the circlein the same point . PROP . XVII . PROB . To draw a straight line from a given point

, either without or in the cir . cumference , which shall

**touch**a given circle . Side 79

If a straight line

of contact , is perpendicular to the line

If a straight line

**touch**a circle , the straight line drawn from the centre to the pointof contact , is perpendicular to the line

**touching**the circle . Let the straight line DE**touch**the circle ABC in the point C ; take the centre F , and draw the straight line ... Side 87

Let the straight line EF

straight line BD be drawn cutting the circle : The angles which BD makes with the

Let the straight line EF

**touch**the circle ABCD in B , and from the point B let thestraight line BD be drawn cutting the circle : The angles which BD makes with the

**touching**line EF shall be equal to . the angles in the alternate segments of the ... Side 90

THEOR , If from any point without a circle two straight lines be drawn , one of

which cuts the circle , and the other

whole line which cuts the circle , and the part of it without the circle , is equal to

the ...

THEOR , If from any point without a circle two straight lines be drawn , one of

which cuts the circle , and the other

**touches**it ; the rectangle contained by thewhole line which cuts the circle , and the part of it without the circle , is equal to

the ...

Side 92

the straight line DE

FD ; then FED is a right ( 18. 3. ) angle : and because DE

and DCA cuts it , the rectangle AD.DC is equal ( 36.3 . ) to the square of DE ; but ...

the straight line DE

**touching**the circle ABC ; find the centre F , and join FE , FB ,FD ; then FED is a right ( 18. 3. ) angle : and because DE

**touches**the circle ABC ,and DCA cuts it , the rectangle AD.DC is equal ( 36.3 . ) to the square of DE ; but ...

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Elements of Geometry: Containing the First Six Books of Euc, With a ... Formerly Chairman Department of Immunology John Playfair,John Playfair Ingen forhåndsvisning tilgjengelig - 2017 |

### Vanlige uttrykk og setninger

ABCD altitude angle ABC angle BAC arch base bisected Book called centre circle circle ABC circumference coincide common cosine cylinder definition demonstrated described diameter difference divided double draw drawn equal equal angles equiangular Euclid 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 PROP 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.