## The school edition. Euclid's Elements of geometry, the first six books, by R. Potts. corrected and enlarged. corrected and improved [including portions of book 11,12]. |

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Resultat 1-5 av 22

Side 57

With the exception of the straight line and the circle , the two most simple loci ; all

other loci , perhaps including also the Conic Sections , may be more readily and

effectually investigated

With the exception of the straight line and the circle , the two most simple loci ; all

other loci , perhaps including also the Conic Sections , may be more readily and

effectually investigated

**algebraically**by means of their rectangular or polar ... Side 100

... Then the area of the triangle is

demonstrations of the first eight propositions , exemplify the obvious axiom , that ,

“ the whole area of every figure in each case , is equal to all the parts of it taken

together ...

... Then the area of the triangle is

**algebraically**represented by bab . Thedemonstrations of the first eight propositions , exemplify the obvious axiom , that ,

“ the whole area of every figure in each case , is equal to all the parts of it taken

together ...

Side 101

A , 6 linear units of the same length . Also suppose the parts BD , DE , EC to

contain m , n , p linear units respectively . Then a = m + n + P , multiply these

equals ...

**Algebraically**. ( fig . Prop . 1 . ) Let the line BC contain a linear units , and the lineA , 6 linear units of the same length . Also suppose the parts BD , DE , EC to

contain m , n , p linear units respectively . Then a = m + n + P , multiply these

equals ...

Side 102

... equal to the squares on the three parts , and twice the rectangles contained by

every two parts . Prop . iv .

a linear units , and the parts of it AC and BC , in and n linear units respectively .

... equal to the squares on the three parts , and twice the rectangles contained by

every two parts . Prop . iv .

**Algebraically**. ( fig . Prop . iv . ) Let the line AB containa linear units , and the parts of it AC and BC , in and n linear units respectively .

Side 103

V .

units . And let CD the line between the points of section contain m linear units .

Then AD the greater of the two unequal parts , contains a + m linear units ; and

DB ...

V .

**Algebraically**. Let AB contain 2a linear units , its half BC will contain a linearunits . And let CD the line between the points of section contain m linear units .

Then AD the greater of the two unequal parts , contains a + m linear units ; and

DB ...

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### Vanlige uttrykk og setninger

ABCD Algebraically Apply base bisected Book chord circle circumference common construction contained definition demonstrated described diagonals diameter difference distance divided double draw drawn equal equal angles equiangular equilateral triangle equimultiples Euclid extremities fall figure formed four fourth Geometrical given circle given line given point given straight line greater half Hence inscribed intersection isosceles join length less Let ABC line drawn magnitudes manner mean meet multiple parallel parallelogram pass perpendicular plane problem produced Prop proportionals proved Q.E.D. PROPOSITION radius ratio reason rectangle rectangle contained regular remaining respectively right angles segment semicircle shew shewn sides similar solid square straight line taken tangent THEOREM third touch triangle ABC twice units vertex wherefore whole

### Populære avsnitt

Side 112 - Guido, with a burnt stick in his hand, demonstrating on the smooth paving-stones of the path, that the square on the hypotenuse of a right-angled triangle is equal to the sum of the squares on the other two sides.

Side 83 - If a straight line be bisected, and produced to any point ; the rectangle contained by the whole line thus produced, and the part of it produced, together with the square...

Side 48 - If two triangles have two sides of the one equal to two sides of the other, each to each ; and...

Side 238 - The first of four magnitudes is said to have the same ratio to the second, which the third has to the fourth, when any equimultiples whatsoever of the first and third being taken, and any equimultiples whatsoever of the second and fourth; if the multiple of the first be less than that of the second, the multiple of the third is also less than that of the fourth...

Side 198 - A LESS magnitude is said to be a part of a greater magnitude, when the less measures the greater, that is, ' when the less is contained a certain number of times exactly in the greater.

Side 271 - SIMILAR triangles are to one another in the duplicate ratio of their homologous sides.

Side 81 - If a straight line be divided into any two parts, the rectangle contained by the whole and one of the parts, is equal to the rectangle contained by the two parts, together with the square of the aforesaid part.

Side 115 - angle in a segment' is the angle contained by two straight lines drawn from any point in the circumference of the segment, to the extremities of the straight line which is the base of the segment.

Side 341 - On the same base, and on the same side of it, there cannot be two triangles...

Side 24 - ... 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.