## 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. Martin1874 |

### Inni boken

Resultat 1-5 av 30

Side 42

...

...

**parallel to BC**. Proof . Because the straight line AD meets the two straight lines EF , BC , and makes the alternate angles EAD , ADC equal to one another , therefore EF is**parallel to BC**( I. 27 ) . Wherefore , through the given point ... Side 45

...

...

**parallel**.**B C**Construction . Join BC . D Demonstration . Then , because AB is parallel to CD , and BC meets them , therefore 1. The angle ABC is equal to the alternate angle BCD ( I. 29 ) ; and because AB is equal to CD , and BC common ... Side 46

...

...

**BC**is a diameter . Then the opposite sides and angles of the figure shall be equal to one another , and the diameter**BC**shall bisect it . A B Demonstration . Because AB is**parallel**to CD , and**BC**meets them , therefore 1. The angle ABC ... Side 49

...

...

**BC**is equal to EH ( Ax . 1 ) , and these lines are parallels , and joined towards the same parts by the straight lines BE , CH ; but straight lines which join the extre- mities of equal and**parallel**...**parallel**( I. 33 ) ; therefore ... Side 50

...

...

**parallel**to CA ( I. 31 ) ; and through C draw CF**parallel**to BD . Demonstration . Then and 1. Each of the figures EBCA , DBCF is a parallelogram ; 2. EBCA is equal to DBCF ( I. 35 ) , because they are upon the same base**BC**, and between ...### Andre utgaver - Vis alle

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

### Vanlige uttrykk og setninger

AC is equal adjacent angles angle ABC angle ACB angle BAC angle BCD angle DEF angle EDF angle equal base BC bisected centre circle ABC circumference constr Demonstration diameter double equal angles equal to F equiangular equilateral triangle equimultiples ex æquali exterior angle fourth given circle given point given straight line gnomon greater ratio inscribed less Let ABC Let the straight linear units meet multiple opposite angle parallel to BC parallelogram perpendicular plane polygon produced proportionals Q.E.D. PROPOSITION quadrilateral rectangle contained remaining angle right angles segment semicircle similar square on AC straight line AB straight line BC straight line drawn three straight lines tiple touches the circle triangle ABC triangle DEF twice the rectangle wherefore

### Populære avsnitt

Side 1 - 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 6 - 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 232 - 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 112 - 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 209 - ... 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 269 - 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 199 - 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 23 - 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 63 - 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 32 - ... 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.