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

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Side 8

Two unequal right lines being given , to take a right line from the

Two unequal right lines being given , to take a right line from the

**greater**equal to the lefjer . ' . Let the two unequal right lines given be A B and c , whereof let A B be the**greater**; it is required to take a right line from A B the ... Side 12

I say , the side A c will be equal to the fide A B. For if ac be unequal to A B , one of them will be the

I say , the side A c will be equal to the fide A B. For if ac be unequal to A B , one of them will be the

**greater**. Let the**greater**be A B , and from the**greater**A B let be taken [ by prop . 3. ) the right line D B equal to the lesser ... Side 13

... CB , each to each ; and the angle DeC is equal to the angle ACB : wherefore the base DC will be equal to the base A B , and the triangle ABC will be equal to the triangle DCB ; the

... CB , each to each ; and the angle DeC is equal to the angle ACB : wherefore the base DC will be equal to the base A B , and the triangle ABC will be equal to the triangle DCB ; the

**greater**to the less ; which is absurd . Side 22

Any one side of every triangle being produced , the outward angle is

Any one side of every triangle being produced , the outward angle is

**greater**than either of the inward opposite angles . Let the triangle be B AC , and let the fide bc be produced to D : I say , the outward angle A CD is**greater**than ... Side 23

the outward angle is

the outward angle is

**greater**than either of the inward and opposite angles . Which was to be demonstrated . PROP . XVII . THEOR . Any two angles of every triangle taken together , are less than two right angles .### Hva folk mener - Skriv en omtale

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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...