Euclid's Elements of Geometry: Chiefly from the Text of Dr. Simson, with Explanatory Notes .... the first six booksJ. W. Parker & son, 1860 - 361 σελίδες |
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Αποτελέσματα 1 - 5 από τα 100.
Σελίδα 11
... join DC . Then , in the triangles DBC , ABC , because DB is equal to AC , and BC is common to both triangles , the two sides DB , BC are equal to the two sides AC , CB , each to each ; and the angle DBC is equal to the angle ACB ; ( hyp ...
... join DC . Then , in the triangles DBC , ABC , because DB is equal to AC , and BC is common to both triangles , the two sides DB , BC are equal to the two sides AC , CB , each to each ; and the angle DBC is equal to the angle ACB ; ( hyp ...
Σελίδα 13
... join DE , on the side of DE remote from A , describe the equilateral triangle DEF ( 1. 1 ) , and join AF . Then the straight line AF shall bisect the angle BAC . Because AD is equal to AE , ( constr . ) and AF is common to the two ...
... join DE , on the side of DE remote from A , describe the equilateral triangle DEF ( 1. 1 ) , and join AF . Then the straight line AF shall bisect the angle BAC . Because AD is equal to AE , ( constr . ) and AF is common to the two ...
Σελίδα 15
... join CH . Then the straight line CH drawn from the given point C , shall be perpendicular to the given straight line AB . Join FC , and CG . Because FH is equal to HG , ( constr . ) and HC is common to the triangles FHC , GHC ; the two ...
... join CH . Then the straight line CH drawn from the given point C , shall be perpendicular to the given straight line AB . Join FC , and CG . Because FH is equal to HG , ( constr . ) and HC is common to the triangles FHC , GHC ; the two ...
Σελίδα 17
... join BE ; produce BE to F , making EF equal to BE , ( 1. 3. ) and join FC . Because AE is equal to EC , and BE to BOOK I. PROP . XV , XVI . 17.
... join BE ; produce BE to F , making EF equal to BE , ( 1. 3. ) and join FC . Because AE is equal to EC , and BE to BOOK I. PROP . XV , XVI . 17.
Σελίδα 30
... join the extremities of two equal and parallel straight lines towards the same parts , are also themselves equal and ... Join BC . Then because AB is parallel to CD , and BC meets them , therefore the angle ABC is equal to the alternate ...
... join the extremities of two equal and parallel straight lines towards the same parts , are also themselves equal and ... Join BC . Then because AB is parallel to CD , and BC meets them , therefore the angle ABC is equal to the alternate ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
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
Δημοφιλή αποσπάσματα
Σελίδα 54 - If two triangles have two sides of the one equal to two sides of the...
Σελίδα 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...
Σελίδα 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.
Σελίδα 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.
Σελίδα 18 - Any two angles of a triangle are together less than two right angles.
Σελίδα 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.
Σελίδα 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.
Σελίδα 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.
Σελίδα 3 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Σελίδα 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...