The Elements of Euclid for the Use of Schools and Colleges: With Notes, an Appendix, and Exercises. comprising the first six books and portions of the eleventh and twelfth books |
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Page 5
... produced ever so far both ways do not meet . [ Note . The terms oblong and rhomboid are not often used . Practically the following definitions are used . Any four - sided figure is called a quadrilateral . A line joining two opposite ...
... produced ever so far both ways do not meet . [ Note . The terms oblong and rhomboid are not often used . Practically the following definitions are used . Any four - sided figure is called a quadrilateral . A line joining two opposite ...
Page 6
... straight lines , being continually produced , shall at length meet on that side on which are the angles which are less than two right angles . PROPOSITION 1. PROBLEM . Ении To describe an equilateral triangle 6 EUCLID'S ELEMENTS-
... straight lines , being continually produced , shall at length meet on that side on which are the angles which are less than two right angles . PROPOSITION 1. PROBLEM . Ении To describe an equilateral triangle 6 EUCLID'S ELEMENTS-
Page 10
... produced the angles on the other side of the base shall be equal to one another . Let ABC be an isosceles triangle , having the side AB equal to the side AC , and let the straight lines AB , AC be produced to D and E : the angle ABC ...
... produced the angles on the other side of the base shall be equal to one another . Let ABC be an isosceles triangle , having the side AB equal to the side AC , and let the straight lines AB , AC be produced to D and E : the angle ABC ...
Page 20
... produced , the exterior angle shall be greater than either of the interior opposite angles . Let ABC be a triangle ... produce it to F , making EF equal to EB , [ I. 3 . and join FC . Because AE is equal to EC , and BE to EF ; [ Constr ...
... produced , the exterior angle shall be greater than either of the interior opposite angles . Let ABC be a triangle ... produce it to F , making EF equal to EB , [ I. 3 . and join FC . Because AE is equal to EC , and BE to EF ; [ Constr ...
Page 21
... produced to G , it may be shewn that the angle BCG , that is the angle ACD , is greater than the angle ABC . [ I. 15 ... Produce BC to D. M. Then because ACD is the exte- rior angle of the triangle ABC , it is greater than the interior ...
... produced to G , it may be shewn that the angle BCG , that is the angle ACD , is greater than the angle ABC . [ I. 15 ... Produce BC to D. M. Then because ACD is the exte- rior angle of the triangle ABC , it is greater than the interior ...
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The Elements of Euclid for the Use of Schools and Colleges: With Notes, an ... Issac Todhunter No preview available - 2014 |
Common terms and phrases
ABCD AC is equal angle ABC angle ACB angle BAC angle EDF angles equal Axiom base BC bisects the angle centre chord circle ABC circle described circumference Construction Corollary describe a circle diameter double draw a straight equal angles equal to F equiangular equilateral equimultiples Euclid Euclid's Elements exterior angle given circle given point given straight line gnomon Hypothesis inscribed intersect isosceles triangle less Let ABC magnitudes middle point multiple opposite angles opposite sides parallelogram perpendicular plane polygon produced proportionals PROPOSITION 13 Q.E.D. PROPOSITION quadrilateral radius rectangle contained rectilineal figure remaining angle rhombus right angles right-angled triangle segment shew shewn side BC square on AC straight line &c straight line drawn tangent THEOREM touches the circle triangle ABC triangle DEF twice the rectangle vertex Wherefore
Popular passages
Page 225 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz.
Page 284 - 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.
Page 73 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a Right Angle; and the straight line which stands on the other is called a Perpendicular to it.
Page 39 - Triangles upon the same base, and between the same parallels, are equal to one another.
Page 10 - THE angles at the base of an isosceles triangle are equal to one another : and, if the equal sides be produced, the angles upon the other side of the base shall be equal.
Page 353 - AB into two parts, so that the rectangle contained by the whole line and one of the parts, shall be equal to the square on the other part.
Page 67 - ... subtending the obtuse angle, is greater than the squares on the sides containing the obtuse angle, by twice the rectangle contained by the side upon which, when produced, the perpendicular falls, and the straight line intercepted without the triangle between the perpendicular and the obtuse angle, Let ABC be an obtuse-angled triangle, having the obtuse angle ACB; and from the point A, let AD be drawn perpendicular to BC produced.
Page 300 - Describe a circle which shall pass through a given point and touch a given straight line and a given circle.
Page xv - PROPOSITION I. PROBLEM. To describe an equilateral triangle upon a given Jinite straight line. Let AB be the given straight line. It is required to describe an equilateral triangle upon AB, From the centre A, at the distance AB, describe the circle BCD ; (post.
Page 36 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.