## The Elements of geometry [Euclid book 1-3] in general terms, with notes &c. &c. Also a variety of problems & theorems. [Ed. by J. Luby. With] The elements of plane geometry, comprising the definitions of the fifth book, and the sixth book in general terms, with notes [&c.] by J. Luby [described as] Pt. 3 |

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Resultat 1-5 av 5

Side 133

Let the segment be greater than a

extremities of the base of those angles . Then the angle at the centre formed by

those con necting lines , is double of each of the given angles , ( prop . 30 , b . 3 .

) ...

Let the segment be greater than a

**semicircle**, conpect the centre with theextremities of the base of those angles . Then the angle at the centre formed by

those con necting lines , is double of each of the given angles , ( prop . 30 , b . 3 .

) ...

Side 138

In a circle , the angle in a

greater than a

than a

Draw a ...

In a circle , the angle in a

**semicircle**is a right angle , the angle in a segmentgreater than a

**semicircle**is ant acute angle , and the angle in a segment lessthan a

**semicircle**is obtuse . Part 1 . The angle in a**semicircle**is a right angle .Draw a ...

Side 139

... the given live in any point ; draw through this point a diameter , the right live

connecting the extremity with the extremity of the diameter remote from the given

line is at right angles to the given live , because it is the angle in a

Cor .

... the given live in any point ; draw through this point a diameter , the right live

connecting the extremity with the extremity of the diameter remote from the given

line is at right angles to the given live , because it is the angle in a

**semicircle**.Cor .

Side 192

The square of the right line ( IL ) , drawn from the obtuse angle ( EIF ) of an

obtuse angled triangle to the point ( L ) in which the circumference of a

described upon the radius of the circumscribing circle , ( draron to the obtuse

angle ...

The square of the right line ( IL ) , drawn from the obtuse angle ( EIF ) of an

obtuse angled triangle to the point ( L ) in which the circumference of a

**semicircle**described upon the radius of the circumscribing circle , ( draron to the obtuse

angle ...

Side 52

If within a

and it centre o be joined with n cutting the second

drawn , then ab : bu : : bv : unot LXXIV . Let A and B be two points without a of

which ...

If within a

**semicircle**a sn on any ordinate sb another**semicircle**be described ,and it centre o be joined with n cutting the second

**semicircle**in t , and sto bedrawn , then ab : bu : : bv : unot LXXIV . Let A and B be two points without a of

which ...

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The Elements of geometry [Euclid book 1-3] in general terms, with notes &c ... Euclides Uten tilgangsbegrensning - 1833 |

### Vanlige uttrykk og setninger

absurd adjacent ANALYSIS arches assumed base centre chord circle circumference common construct describe diagonal diameter difference divided double draw draw a line equal evident external extremity figure formed four fourth given angle given circle given in position given line given point given right line greater half hypothenuse inscribed intercept internal intersect isosceles join less lesser line drawn lines be drawn magnitude mean meet Note O’rs opposite side parallel parallelogram pass perpendicular point of bisection point of contact PROB produced PROP proportional proposition proved radii radius reason rect rectangle remaining required triangle respectively right angled triangle right angles right line segment semicircle side similar square stand subtending Suppose taken tangent THEOR third touch triangle unequal vertex whole line

### Populære avsnitt

Side 130 - The angle at the centre of a circle is double the angle at the circumference on the same arc.

Side 28 - IF three straight lines be proportionals, the rectangle contained by the extremes is equal to the square of the mean ; and if the rectangle contained by the extremes be equal to the square of the mean, the three straight lines are proportionals.

Side 113 - In any triangle, the square of the side subtending an acute angle is less than the sum of the squares of the...

Side 6 - A straight line is said to be cut in extreme and mean ratio, when the whole is to the greater segment as the greater segment is to the less.

Side 98 - If a straight line be divided into any two parts, the square of the whole line is equal to the squares of the two parts, together with twice the rectangle contained by the parts.

Side 4 - Convertendo ; when it is .concluded, that if there be four magnitudes proportional, the first is to the sum or difference of the first and second, as the third is to the sum or difference of the third and fourth.

Side 20 - DE : but equal triangles on the same base and on the same side of it, are between the same parallels ; (i.

Side 118 - If any two points be taken in the circumference of a circle, the straight line which joins them shall fall within the circle.

Side 158 - The sum of the squares of the sides of any quadrilateral is equal to the sum of the squares of the diagonals plus four times the square of the line joining the middle points of the diagonals.

Side 30 - Similar triangles are to one another in the duplicate ratio of their homologous sides.