## The Elements of Euclid, containing the first six books, with a selection of geometrical problems. To which is added the parts of the eleventh and twelfth books which are usually read at the universities. By J. Martin |

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Resultat 1-5 av 17

Side 102

FG must pass through the point A. Therefore , if two

PROPOSITION 13. - Theorem . One

than one , whether it

Let the ...

FG must pass through the point A. Therefore , if two

**circles**, & c . Q.E.D.PROPOSITION 13. - Theorem . One

**circle**cannot touch another in more pointsthan one , whether it

**touches**it on the inside or outside . H B A А E E : H D First .Let the ...

Side 109

From this it is manifest , that the straight line which is drawn at right anges to the

diameter of a circle from the extremity of it ,

that it touches it only in one point , because , if it did meet the circle in two , it

would ...

From this it is manifest , that the straight line which is drawn at right anges to the

diameter of a circle from the extremity of it ,

**touches the circle**( III . Def . 2 ) ; andthat it touches it only in one point , because , if it did meet the circle in two , it

would ...

Side 110

AB

given point be in the circumference of the circle , as the point D , draw DE to the

centre E , and DF at right angles to DE ; then 1. DF

. ) ...

AB

**touches the circle**, and it is drawn from the given point A. Secondly . If thegiven point be in the circumference of the circle , as the point D , draw DE to the

centre E , and DF at right angles to DE ; then 1. DF

**touches the circle**( III . 16. Cor. ) ...

Side 112

Demonstration . Because DE

centre to the point of contact , therefore 1. FC is perpendicular to DE ( III . 18 ) ;

therefore 2. FCE is a right angle ; but ACE is also a right angle ( hyp . ) ; therefore

3.

Demonstration . Because DE

**touches the circle**ABC , and FC is drawn from thecentre to the point of contact , therefore 1. FC is perpendicular to DE ( III . 18 ) ;

therefore 2. FCE is a right angle ; but ACE is also a right angle ( hyp . ) ; therefore

3.

Side 126

makes with the line

the alternate segments of the circle . Let the straight line EF touch the circle

ABCD in B , and from the point B let the straight line BD be drawn , meeting the ...

makes with the line

**touching the circle**shall be equal to the angles which are inthe alternate segments of the circle . Let the straight line EF touch the circle

ABCD in B , and from the point B let the straight line BD be drawn , meeting the ...

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The Elements of Euclid, Containing the First Six Books, with a Selection of ... Euclides Ingen forhåndsvisning tilgjengelig - 2016 |

### Vanlige uttrykk og setninger

ABCD AC is equal alternate angle ABC angle ACB angle BAC base base BC bisected centre circle ABC circumference common compounded constr Construction contained Demonstration describe diameter divided double draw equal angles equiangular equimultiples exterior angle extremities fall figure four fourth given point given straight line greater half inscribed interior join less Let ABC likewise magnitudes manner meet multiple opposite angle parallel parallelogram pass perpendicular plane polygon Problem produced proportionals proved Q.E.D. PROPOSITION ratio reason rectangle rectangle contained rectilineal figure remaining angle right angles segment shown sides similar square square on AC taken third touches the circle triangle ABC unequal wherefore whole

### Populære avsnitt

Side 4 - If a straight line meets two straight lines, so as to make the two interior angles on the same side of it taken together less than two right angles...

Side 230 - If two triangles, which have two sides of the one proportional to two sides of the other, be joined at one angle, so as to have their homologous sides parallel to one another, the remaining sides shall be in a straight line. Let...

Side 110 - The angle in a semicircle is a right angle; the angle in a segment greater than a semicircle is less than a right angle; and the angle in a segment less than a semicircle is greater than a right angle.

Side 207 - ... triangles which have one angle in the one equal to one angle in the other, and their sides about the equal angles reciprocally proportional, are equal to one another.

Side 267 - The areas of two triangles which have an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles. D c A' D' Hyp. In triangles ABC and A'B'C', ZA = ZA'. To prove AABC = ABxAC. A A'B'C' A'B'xA'C' Proof. Draw the altitudes BD and B'D'.

Side 197 - 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 21 - If two triangles have two angles of the one equal to two angles of the other, each to each, and also one side of the one equal to the corresponding side of the other, the triangles are congruent.

Side 61 - If a straight line be divided into two equal, and also into two unequal parts, the squares on the two unequal parts are together double of the square on half the line and of the square on the line between the points of section. Let the straight line AB be divided into two equal parts...

Side 30 - ... twice as many right angles as the figure has sides ; 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.