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 páginas |
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Página 8
... greater of two given straight lines to cut off a part equal to the less . Let AB and C be the two given straight lines , of which AB is the greater : it is required to cut 8 EUCLID'S ELEMENTS .
... greater of two given straight lines to cut off a part equal to the less . Let AB and C be the two given straight lines , of which AB is the greater : it is required to cut 8 EUCLID'S ELEMENTS .
Página 9
... greater : it is required to cut off from AB , the greater , a part equal to C the less . From the point A draw the straight line AD equal to C ; [ I. 2 . and from the centre A , at the distance AD , describe the circle DEF meeting AB at ...
... greater : it is required to cut off from AB , the greater , a part equal to C the less . From the point A draw the straight line AD equal to C ; [ I. 2 . and from the centre A , at the distance AD , describe the circle DEF meeting AB at ...
Página 12
... greater than the other . Let AB be the greater , and from it cut off DB equal to AC the less , and join DC . Then , because in the triangles DBC , ACB , DB is equal to AC , and BC is common to both , B A ་ [ I. 3 . [ Construction . the ...
... greater than the other . Let AB be the greater , and from it cut off DB equal to AC the less , and join DC . Then , because in the triangles DBC , ACB , DB is equal to AC , and BC is common to both , B A ་ [ I. 3 . [ Construction . the ...
Página 13
... greater than the angle BCD ; much more then is the angle BDC greater than the angle BCD . Again , because BC is equal to BD , the angle BDC is equal to the angle BCD . [ Hypothesis . [ I. 5 . But it has been shewn to be greater ; which ...
... greater than the angle BCD ; much more then is the angle BDC greater than the angle BCD . Again , because BC is equal to BD , the angle BDC is equal to the angle BCD . [ Hypothesis . [ I. 5 . But it has been shewn to be greater ; which ...
Página 20
... greater than either of the interior opposite angles . Let ABC be a triangle , and let one side BC be pro- duced to D : the exterior angle ACD shall be greater than either of the interior opposite angles CBA , BAC . Bisect AC at E , [ I ...
... greater than either of the interior opposite angles . Let ABC be a triangle , and let one side BC be pro- duced to D : the exterior angle ACD shall be greater than either of the interior opposite angles CBA , BAC . Bisect AC at E , [ I ...
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Términos y frases comunes
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
Pasajes populares
Página 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.
Página 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...
Página 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.
Página 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.
Página 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.
Página 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.
Página 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.
Página 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.
Página 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.
Página 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.