## A companion to Euclid: being a help to the understanding and remembering of the first four books. With a set of improved figures, and an original demonstration of the proposition called in Euclid the twelfth axiom, by a graduate |

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Resultat 1-5 av 5

Side 14

And here let it be remarked that the usual editions of Euclid are calculated to

mislead , or at

indirect propositions . For instance , instead of saying ( as in Simpson ) , let AB be

greater ...

And here let it be remarked that the usual editions of Euclid are calculated to

mislead , or at

**least**to puzzle , the learner , in their manner of proving theseindirect propositions . For instance , instead of saying ( as in Simpson ) , let AB be

greater ...

Side 53

If a point be taken in the diameter of a circle , of all the straight lines which can be

drawn from it to the circumference , the greatest is that in which the centre is , and

the other part of that diameter is the

If a point be taken in the diameter of a circle , of all the straight lines which can be

drawn from it to the circumference , the greatest is that in which the centre is , and

the other part of that diameter is the

**least**; and of any others , that which is the ... Side 54

... and of the rest , that which is nearest to that which passes through the centre ,

is always greater than the more remote ; but of those which fall on the convex

circumference , the

diameter ...

... and of the rest , that which is nearest to that which passes through the centre ,

is always greater than the more remote ; but of those which fall on the convex

circumference , the

**least**is that between the point without the circle and thediameter ...

Side 55

That of those lines which fall on the convex O , is the

> DH . III . That from u there can only be drawn two equal right lines to the O , one

on each side of the

That of those lines which fall on the convex O , is the

**least**, and DK > DL , and DL> DH . III . That from u there can only be drawn two equal right lines to the O , one

on each side of the

**least**line . Steps of the Demonstration to Part 1 . 1 . Side 56

Then suppose that from point d to the o another line on besides DB can be drawn

= DK ; and show , on that supposition , 2 . that DB = Dx ; i . e . a line near to the

Then suppose that from point d to the o another line on besides DB can be drawn

= DK ; and show , on that supposition , 2 . that DB = Dx ; i . e . a line near to the

**least**= one more remote , which , by the preceding part of the demonstration is ...### Hva folk mener - Skriv en omtale

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### Vanlige uttrykk og setninger

alternate angle contained angle equal applied Argument ad absurdum base bisect BOOK centre circumference coincides construction Demonstration described diameter directed divided draw drawn Edition Engravings equal equiangular equilateral Euclid extremities fall figure given circle given point given rectilineal given straight line greater HISTORY impossible inscribe interior joins learner least less meet Nature necessary opposite parallel parallelogram pass pentagon point of contact Problem produced proof PROPOSITION PROPOSITION VIII PROPOSITION XV Proved by showing READINGS rectangle contained right angles right line right Zs segment shows the supposition sides similarly square Steps straight line Suppose supposition is false Theorem touch triangle VOLUME whole whole line YOUNG

### Populære avsnitt

Side 24 - 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, namely, either t}le sides adjacent to the equal...

Side 45 - To divide a given straight line into two parts, so that the rectangle contained by the whole and one of the parts, shall be equal to the square of the other part.

Side 18 - If, at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line.

Side 61 - From this it is manifest that the straight line which is drawn at right angles to the diameter of a circle from the extremity of it, touches the circle...

Side 37 - 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 76 - IF from any point without a circle two straight lines be drawn, one of which cuts the circle, and the other touches it ; the rectangle contained by the whole line which cuts the circle, and the part of it without the circle, shall be equal to the square of the line which touches it.

Side 77 - If from a point without a circle there be drawn two straight lines, one of which cuts the circle, and the other meets it, and if the rectangle contained by the whole line which cuts the circle, and the part of it without the circle, be equal to the square on GEOMETRY.

Side 72 - If a straight line touch a circle, and from the point of contact a straight line be drawn at right angles to the touching line, the centre of the circle shall be in that line.

Side 27 - If a straight line fall on two parallel straight lines, it makes the alternate angles equal to one another, and the exterior angle equal to the interior and opposite angle on the same side; and also the two interior angles on the same side together equal to two right angles.