## 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. Martin |

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Side 11

Let AB and C be the two given straight lines , of which AB is the

required to cut off from AB the

Construction . From the point A draw the straight line AD equal to C ( I. 2 ) ; and

from the ...

Let AB and C be the two given straight lines , of which AB is the

**greater**. It isrequired to cut off from AB the

**greater**, a part equal to C the less . D 3 A FConstruction . From the point A draw the straight line AD equal to C ( I. 2 ) ; and

from the ...

Side 14

For , if AB be not equal to AC , one of them is

let AB be

and join DC . * An abbreviation for quod erat demonstrandum - that is , “ which

was ...

For , if AB be not equal to AC , one of them is

**greater**than the other . If possible ,let AB be

**greater**than AC ; and from BA cut off BD equal to CA the less ( I. 3 ) ,and join DC . * An abbreviation for quod erat demonstrandum - that is , “ which

was ...

Side 16

But the angle ACD is

angle ADC is

But the angle ACD is

**greater**than the angle BCD ( Ax . 9 ) ; therefore also 2. Theangle ADC is

**greater**than BCD ; much more therefore 3. The angle BDC is**greater**than the angle BCD . Again , because the side BC is equal to BD in the ... Side 17

The angles ECD , FDC are equal to one another ( I. 5 ) ; but the angle ECD

than the angle BCD ; much more then 3. The angle BDC is

...

The angles ECD , FDC are equal to one another ( I. 5 ) ; but the angle ECD

**greater**than the angle BCD ( Ax . 9 ) ; therefore also 2. The angle FDC is**greater**than the angle BCD ; much more then 3. The angle BDC is

**greater**than the angle...

Side 21

... ABE is equal to the angle EBC ; wherefore 3. The angle EBD is equal to the

angle EBC ( Ax . 1 ) , the less equal to the

Therefore , 4. Two straight lines cannot have a common segment .

PROPOSITION 12.

... ABE is equal to the angle EBC ; wherefore 3. The angle EBD is equal to the

angle EBC ( Ax . 1 ) , the less equal to the

**greater**angle , which is impossible .Therefore , 4. Two straight lines cannot have a common segment .

PROPOSITION 12.

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

### Vanlige uttrykk og setninger

ABCD AC is equal alternate angle ABC angle ACB angle BAC base base BC bisected centre circle ABC circumference common compounded constr Construction contained Demonstration describe diameter divided double draw equal angles equiangular equimultiples exterior angle extremities fall figure four fourth given point given straight line greater half inscribed interior join less Let ABC likewise magnitudes manner meet multiple opposite angle parallel parallelogram pass perpendicular plane polygon Problem produced proportionals proved Q.E.D. PROPOSITION ratio reason rectangle rectangle contained rectilineal figure remaining angle right angles segment shown sides similar square square on AC taken third touches the circle triangle ABC unequal wherefore whole

### Populære avsnitt

Side 4 - 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 230 - 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 110 - 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 207 - ... 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 267 - 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 197 - 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 21 - 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 61 - 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 30 - ... 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.