The Elements of Euclid for the Use of Schools and Colleges: Comprising the First Six Books and Portions of the Eleventh and Twelfth Books : with Notes, an Appendix, and ExercisesMacmillan, 1867 - 400 σελίδες |
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Σελίδα 247
... formed by drawing straight lines to touch the circle at the points E , F , G , H ; and the square thus formed is greater than the circle ; therefore the square EFGH is greater than half of the circle . Bisect the arcs EF , FG , GH , HE ...
... formed by drawing straight lines to touch the circle at the points E , F , G , H ; and the square thus formed is greater than the circle ; therefore the square EFGH is greater than half of the circle . Bisect the arcs EF , FG , GH , HE ...
Σελίδα 252
... formed by the meeting of two curved lines , or of a straight line and a curved line ; this definition however is of no importance , as the only angles ever considered are such as are formed by straight lines . The definition of a plane ...
... formed by the meeting of two curved lines , or of a straight line and a curved line ; this definition however is of no importance , as the only angles ever considered are such as are formed by straight lines . The definition of a plane ...
Σελίδα 255
... formed by the base of a triangle and the sides pro- duced be equal , the sides of the triangle are equal ; this pro- position is true and will serve as an exercise for the student . The converse of a true proposition is not necessarily ...
... formed by the base of a triangle and the sides pro- duced be equal , the sides of the triangle are equal ; this pro- position is true and will serve as an exercise for the student . The converse of a true proposition is not necessarily ...
Σελίδα 257
... formed on the other side of BC by these produced parts , and each of them would be equal to the angle BCG . The opinion has been maintained that even in I. I , it is tacitly assumed that the straight lines AC and BC cannot have a common ...
... formed on the other side of BC by these produced parts , and each of them would be equal to the angle BCG . The opinion has been maintained that even in I. I , it is tacitly assumed that the straight lines AC and BC cannot have a common ...
Σελίδα 289
... formed , and if the vertices be put on the same side of the base another solid is formed . The two solids thus formed are con tained by the same number of similar and equal plane figures , but they are not equal . It will be observed ...
... formed , and if the vertices be put on the same side of the base another solid is formed . The two solids thus formed are con tained by the same number of similar and equal plane figures , but they are not equal . It will be observed ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
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 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
Δημοφιλή αποσπάσματα
Σελίδα 35 - IF a side of any triangle be produced, the exterior angle is equal to the two interior and opposite angles ; and the three interior angles of every triangle are equal to two right angles.
Σελίδα 67 - 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 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...
Σελίδα 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.
Σελίδα 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.
Σελίδα 50 - In any right-angled triangle, the square which is described upon the side subtending the right angle, is equal to the squares described upon the sides which contain the right angle.
Σελίδα 57 - If a straight line be divided into two equal parts, and also into two unequal parts ; the rectangle contained by the unequal parts, together with the square on the line between the points of section, is equal to the square on half the line.
Σελίδα 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.
Σελίδα 227 - If two straight lines be at right angles to the same plane, they shall be parallel to one another. Let the straight lines AB, CD be at right angles to the same plane : AB is parallel to CD.
Σελίδα 102 - 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 352 - Prove that the square on any straight line drawn from the vertex of an isosceles triangle to the base, is less than the square on a side of the triangle by the rectangle contained by the segments of the base : and conversely.