## The First Six and the Eleventh and Twelfth Books of Euclid's Elements: With Notes and Illus., and an Appendix in Five Books |

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Side 22

Produce BC to D ; and because ACD is the exterior angle of the

greater than the interior and , remote

therefore the angles ACD, ACB are greater (I. ax. 4.) ^- than ABC, ACB; but A CD,

...

Produce BC to D ; and because ACD is the exterior angle of the

**triangle ABC**, it isgreater than the interior and , remote

**angle ABC**; to each of these add ACB :therefore the angles ACD, ACB are greater (I. ax. 4.) ^- than ABC, ACB; but A CD,

...

Side 32

Let ABC be a triangle, and let one of its sides BC be produced to D : (1) the

exterior angle ACD is equal to the two interior and remote angles CAB, ABC; and

(2.) the three interior

angles.

Let ABC be a triangle, and let one of its sides BC be produced to D : (1) the

exterior angle ACD is equal to the two interior and remote angles CAB, ABC; and

(2.) the three interior

**angles**,**ABC**, BCA, CAB, are together equal to two rightangles.

Side 34

Then, because AB is \U2 \ parallel to CD, and BC meets them, the alter- C 12

nate

and BC common to the two triangles ABC, DCB, and the

the ...

Then, because AB is \U2 \ parallel to CD, and BC meets them, the alter- C 12

nate

**angles ABC**, BCD are (I. 29.) equal; and because AB is equal (hyp.) to CD,and BC common to the two triangles ABC, DCB, and the

**angle ABC**is equal tothe ...

Side 143

angular, and the equal angles are opposite to the homologous sides, viz., the

straight line EF, make (I. 23.) the angle FEG equal to B, and EFG equal to C. Then

...

angular, and the equal angles are opposite to the homologous sides, viz., the

**angle ABC**equal to DEF, BCA to EFD, and BAC to EDF. At the points E, F, in thestraight line EF, make (I. 23.) the angle FEG equal to B, and EFG equal to C. Then

...

Side 283

Let

or which we know the means of effecting. ... of the following easy problem. Given

the perimeter and

Let

**ABC**be a right**angle**given in position, and let there be a is known to be true,or which we know the means of effecting. ... of the following easy problem. Given

the perimeter and

**angles**of a**triangle**, to construct it. Analysis.—Suppose**ABC**...### Hva folk mener - Skriv en omtale

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The First Six and the Eleventh and Twelfth Books of Euclid's Elements: With ... Euclid Ingen forhåndsvisning tilgjengelig - 2016 |

### Vanlige uttrykk og setninger

ABCD altitude angle ABC angle BAC angle equal BC is equal bisected centre chord circle ABC circumference cone const contained cylinder describe a circle diagonal diameter divided draw equal angles equal to AC equiangular equilateral Euclid exterior angle fore fourth given circle given point given ratio given straight line greater half Hence hypotenuse inscribed join less Let ABC magnitudes manner multiple opposite parallel parallelepiped parallelogram perpendicular polygon polyhedron prism PROB produced PROP proportional proposition pyramid radius rectangle rectilineal figure right angles Schol segments semicircle sides similar similar triangles solid angles square of AC straight lines drawn tangent THEOR third triangle ABC triplicate ratio vertex vertical angle wherefore

### Populære avsnitt

Side 94 - 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.

Side 53 - If a straight line be divided into any two parts, the squares of the whole line and of one of the parts are equal to twice the rectangle contained by the whole and that part, together with the square of the other part. Let the straight line AB be divided into any two parts at the point C : the squares of AB, BC shall be equal to twice the rectangle AB, BC, together with the square of AC.

Side 143 - 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 4 - A rhombus is that which has all its sides equal, but its angles are not right angles.

Side 57 - To divide a given straight line into two parts, so that the rectangle contained by the whole and one of the parts may be equal to the square on the other part.

Side 138 - IF a straight line be drawn parallel to one of the sides of a triangle, it shall cut the other sides, or those produced, proportionally; and if the sides, or the sides produced, be cut proportionally, the straight line which joins the points of section shall be parallel to the remaining side of the triangle...

Side 43 - In any right-angled triangle, the square which is described upon the side subtending the right angle, is equal to the squares described upon the sides which contain the right angle.

Side 32 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.

Side 40 - To a given straight line to apply a parallelogram, which shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.

Side 36 - PARALLELOGRAMS upon the same base, and between the same parallels, are equal to one another...