## Euclid's Elements of Geometry: The First Six, the Eleventh and Twelfth Books |

### Inni boken

Resultat 1-5 av 80

Side xv

... or solid , except a few of Euclid's Propositions , and

... or solid , except a few of Euclid's Propositions , and

**half**a Dozen of the principal Properties of the Three Conick Sections ; and executed by a few simple and common Instruments , without Reference to any other Treatise . 1 i * . Side 35

Again , H B let FG be cut in

Again , H B let FG be cut in

**half**in H , and equal K to hf let be put F B , and to kg , L GD ; then draw BD ! I say , that o G D the lines A B , CD may for ever be thus prolonged , yet never fhall they meet together . Side 42

draw the right line B E parallel to the right line c A ; and through c draw C F parallel to B.D. Then EBCA , D BC F are A D F both parallelograms , and the angle A B C is the one

draw the right line B E parallel to the right line c A ; and through c draw C F parallel to B.D. Then EBCA , D BC F are A D F both parallelograms , and the angle A B C is the one

**half**of the. parallelogram E BCA ( by prop . 35. ] ... Side 43

angle A B C is the one

angle A B C is the one

**half**of the parallelogram E BCA ; since the diameter A I cuts into halves , and the triangle DBC the one**half**of the parallelogram DBCF ; because [ by prop . 34. ] the diameter Dc cuts it into halves . Side 62

Which was to be demonstrated . PRO P. VI . THEOR . In every triangle , the angle contained under the perpendicular drawn from the angle opposite to the base upon it , and tke right line bisecting that angle , will be one

Which was to be demonstrated . PRO P. VI . THEOR . In every triangle , the angle contained under the perpendicular drawn from the angle opposite to the base upon it , and tke right line bisecting that angle , will be one

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Euclid's Elements of Geometry: The First Six, the Eleventh and Twelfth Books Euclid,David Gregory Ingen forhåndsvisning tilgjengelig - 2016 |

### Vanlige uttrykk og setninger

A B C ABCD added alſo altitude baſe becauſe centre circle circumference common cone cylinder definition demonſtrated deſcribed diameter difference divided double draw drawn equal equal angles equiangular equimultiples Euclid exceeds fall fame fides figure firſt folid fore fourth given right line greater half inſcribed join leſs magnitudes manner meet multiple oppoſite parallel parallelogram perpendicular plane polygon priſms PROP proportional propoſition proved pyramid ratio rectangle remaining angle right angles right line A B right lined figure ſame ſay ſecond ſegment ſhall ſides ſimilar ſince ſolid ſome ſphere ſquare ſtand ſum taken THEOR theſe third thoſe thro touch triangle triangle ABC twice vertex Wherefore whole whoſe baſe

### Populære avsnitt

Side 247 - 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 30 - 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. either the sides adjacent to the equal...

Side 248 - But it was proved that the angle AGB is equal to the angle at F ; therefore the angle at F is greater than a right angle : But by the hypothesis, it is less than a right angle ; which is absurd.

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

Side 32 - Let the straight line EF, which falls upon the two straight lines AB, CD, make the alternate angles AEF, EFD equal to one another; AB is parallel to CD.

Side 56 - 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.

Side 391 - KL: but the cylinder CM is equal to the cylinder EB, and the axis LN to the axis GH; therefore as the cylinder EB to...

Side 110 - If any two points be taken in the circumference of a circle, the straight line which joins them shall fall within the circle.

Side 130 - When you have proved that the three angles of every triangle are equal to two right angles...

Side 183 - FK : in the same manner it may be demonstrated, that FL, FM, FG are each of them equal to FH, or FK : therefore the five straight lines FG, FH, FK, FL, FM are equal to one another : wherefore the circle described from the centre F, at the distance of...