Euclid's Elements of geometry, books i. ii. iii. iv1862 |
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Página 3
Euclides. 28. An obtuse - angled triangle is that which has an obtuse angle . 29. An acute - angled triangle is that which has three acute angles ... opposite sides equal to one another , but all its sides are not equal , nor its angles right ...
Euclides. 28. An obtuse - angled triangle is that which has an obtuse angle . 29. An acute - angled triangle is that which has three acute angles ... opposite sides equal to one another , but all its sides are not equal , nor its angles right ...
Página 7
... angles shall be equal , each to each , viz . those to which the equal sides are opposite . Or , If two sides and the contained angle of one triangle be re- spectively equal to those of another , the triangles are equal in every respect ...
... angles shall be equal , each to each , viz . those to which the equal sides are opposite . Or , If two sides and the contained angle of one triangle be re- spectively equal to those of another , the triangles are equal in every respect ...
Página 9
Euclides. 5. And the remaining angles of the one are equal to the remaining angles of the other , each to each , to which the equal sides are opposite , viz . the angle ACF to the angle ABG , and the angle AFC to the angle AGB . ( I. 4 ...
Euclides. 5. And the remaining angles of the one are equal to the remaining angles of the other , each to each , to which the equal sides are opposite , viz . the angle ACF to the angle ABG , and the angle AFC to the angle AGB . ( I. 4 ...
Página 16
... angle DBA is equal to the two angles DBE , EBA ; to each of these equals add ... opposite sides of it , make the adjacent angles together equal to two right ... opposite sides of AB , make the adjacent angles ABC , ABD , together equal to ...
... angle DBA is equal to the two angles DBE , EBA ; to each of these equals add ... opposite sides of it , make the adjacent angles together equal to two right ... opposite sides of AB , make the adjacent angles ABC , ABD , together equal to ...
Página 17
... opposite angles shall be equal . ( References - Prop . I. 13 ; ax . 1 , 3. ) Hypothesis . - Let the two straight lines AB , CD , cut one another in the point E. Sequence . The angle AEC shall be equal to the angle DEB , and the angle ...
... opposite angles shall be equal . ( References - Prop . I. 13 ; ax . 1 , 3. ) Hypothesis . - Let the two straight lines AB , CD , cut one another in the point E. Sequence . The angle AEC shall be equal to the angle DEB , and the angle ...
Términos y frases comunes
AB is equal AC and CB adjacent angles angle ABC angle AGH angle BAC angle BCD angle EAB angle EDF angle equal angles CBA base BC BC is equal bisected circle ABC circumference Conclusion Conclusion.-Therefore const Construction.-1 Demonstration.-1 describe the circle diameter double equal angles equal to CD equiangular exterior angle given circle given point given rectilineal angle given straight line Given.-Let ABCD gnomon greater Hypothesis inscribed interior and opposite isosceles triangle less opposite angle parallel to CD parallelogram perpendicular point F produced Q. E. D. PROPOSITION rectangle AB BC rectangle AE rectangle contained rectilineal figure References-Prop remaining angle required to describe right angles segment semicircle Sequence side BC square on AC straight line AC straight line drawn touches the circle triangle ABC triangle DEF twice the rectangle
Pasajes populares
Página 25 - 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.
Página 2 - A circle is a plane figure contained by one 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.
Página 99 - 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 4 - If a straight line meets two straight lines, so as to " make the two interior angles on the same side of it taken " together less than two right angles...
Página 66 - ... 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...
Página 65 - To divide a given straight line into two parts, so that the rectangle contained by the whole, and one of the parts, may be equal to the square of the other part.
Página 32 - F, which is the common vertex of the triangles ; that is, together with four right angles. Therefore all the angles of the figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Página 58 - 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...
Página 88 - The straight line drawn at right angles to the diameter of a circle, from the extremity of it, falls without the circle...
Página 33 - The straight lines which join the extremities of two equal and parallel straight lines towards the same parts, are also themselves equal and parallel.