Euclid's Elements of Geometry: Chiefly from the Text of Dr. Simson, with Explanatory Notes .... the first six booksJ. W. Parker & son, 1860 - 361 Seiten |
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Seite 3
... line , which is called the circumference , and is such that all straight lines drawn from a certain point within the figure to the circumference , are equal to one another . XVI . And this point is called the center of the circle . XVII ...
... line , which is called the circumference , and is such that all straight lines drawn from a certain point within the figure to the circumference , are equal to one another . XVI . And this point is called the center of the circle . XVII ...
Seite 14
... draw a straight line at right angles to a given straight line , from a given point in the same . Let AB be the given straight line , and Ca given point in it . It is required to draw a straight line from the point C at right angles to ...
... draw a straight line at right angles to a given straight line , from a given point in the same . Let AB be the given straight line , and Ca given point in it . It is required to draw a straight line from the point C at right angles to ...
Seite 15
... line , which may be produced any length both ways , and let C be a point without it . It is required to draw a ... drawn from the given point C , shall be perpendicular to the given straight line AB . Join FC , and CG . Because FH is ...
... line , which may be produced any length both ways , and let C be a point without it . It is required to draw a ... drawn from the given point C , shall be perpendicular to the given straight line AB . Join FC , and CG . Because FH is ...
Seite 28
... lines which are parallel , & c . Q. E.D. PROPOSITION XXXI . PROBLEM . To draw a straight line through a given point parallel to a given straigh line . Let A be the given point , and BC the given straight line . It is required to draw ...
... lines which are parallel , & c . Q. E.D. PROPOSITION XXXI . PROBLEM . To draw a straight line through a given point parallel to a given straigh line . Let A be the given point , and BC the given straight line . It is required to draw ...
Seite 35
... line drawn from A but AD is parallel to BC ; AD is therefore parallel to BC . Wherefore , equal triangles upon , & c . Q. E.D. PROPOSITION XL . THEOREM . Equal triangles upon equal bases in the same straight line , and towards the same ...
... line drawn from A but AD is parallel to BC ; AD is therefore parallel to BC . Wherefore , equal triangles upon , & c . Q. E.D. PROPOSITION XL . THEOREM . Equal triangles upon equal bases in the same straight line , and towards the same ...
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Häufige Begriffe und Wortgruppen
A₁ ABCD AC is equal Algebraically angle ABC angle ACB angle BAC Apply Euc axiom base BC chord circle ABC constr describe a circle diagonals diameter divided double draw equal angles equiangular equilateral triangle equimultiples Euclid Euclid's Elements exterior angle Geometrical given circle given line given point given straight line given triangle gnomon greater hypotenuse inscribed intersection isosceles triangle less Let ABC line AC lines be drawn meet the circumference multiple opposite angles parallelogram pentagon perpendicular porism problem produced Prop proportionals proved Q.E.D. PROPOSITION quadrilateral radius ratio rectangle contained rectilineal figure remaining angle right angles right-angled triangle segment semicircle shew shewn similar similar triangles square on AC tangent THEOREM touch the circle trapezium triangle ABC twice the rectangle vertex vertical angle wherefore
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Seite 54 - If two triangles have two sides of the one equal to two sides of the...
Seite 89 - 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...
Seite 38 - Let ABCD be the given rectilineal figure, and E the given rectilineal angle. It is required to describe a parallelogram equal to ABCD, and having an angle equal to E.
Seite 144 - 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.
Seite 18 - Any two angles of a triangle are together less than two right angles.
Seite 266 - 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.
Seite 152 - 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.
Seite 7 - From a given point to draw a straight line equal to a given straight line. Let A be the given point, and BC the given straight line; it is required to draw from the point A a straight line equal to BC.
Seite 3 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Seite 96 - In obtuse-angled triangles, if a perpendicular be drawn from either of the acute angles to the opposite side produced, the square on the side subtending the obtuse angle is greater than the squares on the sides containing the obtuse angle, by twice the rectangle contained by the side...