Elements of plane geometry, book i, containing nearly the same propositions as the first book of Euclid's Elements1865 |
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Side 9
... circle to the measurement of angular magnitude , and he is certainly known to have dis- covered the important proposition , that all the angles in a semicircle are right angles . Pythagoras also has the singular honour of discovering ...
... circle to the measurement of angular magnitude , and he is certainly known to have dis- covered the important proposition , that all the angles in a semicircle are right angles . Pythagoras also has the singular honour of discovering ...
Side 10
... circle probably engaged their attention only as a convenient instrument in the construction of such figures . The proper- ties of this curve soon , however , became objects of inquiry , and a few of them were discovered at an early ...
... circle probably engaged their attention only as a convenient instrument in the construction of such figures . The proper- ties of this curve soon , however , became objects of inquiry , and a few of them were discovered at an early ...
Side 11
... circle ; and these two figures belong to plane geometry . But if a cone be cut by a plane parallel to another plane touching the conic surface , the section will be a parabola ; if cut by a plane inclined to the base , the section will ...
... circle ; and these two figures belong to plane geometry . But if a cone be cut by a plane parallel to another plane touching the conic surface , the section will be a parabola ; if cut by a plane inclined to the base , the section will ...
Side 12
... of curves . The methods of demon- stration which they had hitherto employed were amply suf- ficient for the comparison of triangles or circles with each other , but could not be extended to the comparison 12 PREFACE .
... of curves . The methods of demon- stration which they had hitherto employed were amply suf- ficient for the comparison of triangles or circles with each other , but could not be extended to the comparison 12 PREFACE .
Side 23
... circle , which is represented as described by the revolution of a straight line about one of its extremities which remains fixed . The describing line is called the radiant or straight line , which determines the magnitude of the radii ...
... circle , which is represented as described by the revolution of a straight line about one of its extremities which remains fixed . The describing line is called the radiant or straight line , which determines the magnitude of the radii ...
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Elements of Plane Geometry, Book: Containing Nearly the Same Propositions As ... Euclid Ingen forhåndsvisning tilgjengelig - 2008 |
Vanlige uttrykk og setninger
AB is equal ABC and DEF ABC is equal acute adjacent angles ancient geometers angle ACD angle AGH angle BAC angles ABC angles equal angular magnitude base BC bisect centre circumference coincide diagonal drawn EBCF equal alternate angles equal Def equal to BC Euclid EUCLID'S ELEMENTS exterior angle figure has sides four right angles geometers given point given straight line greater than AC included angle interior opposite angle intersect isosceles triangle join less Let ABC Let the straight method method of exhaustions parallel lines parallel to CD parallelogram ABCD perpendicular PLANE GEOMETRY point F PROB proof properties of parallel PROPOSITION Pythagoras radius rectangle rectilineal figure reductio ad absurdum Scholium side AB side AC straight line BC THEOR theorem three angles three sides triangle ABC triangle DEF triangles are equal truths unequal vertex vertical angle wherefore
Populære avsnitt
Side 43 - If two triangles have two sides and the included angle of the one, equal to two sides and the included angle of the other, each to each, the two triangles will be equal.
Side 46 - Any two angles of a triangle are together less than two right angles.
Side 37 - The angles which one straight line makes with another upon one tide of it, are either two right angles, or are together equal to two right angles. Let the straight line AB make with CD, upon one side of it the angles CBA, ABD ; these are either two right angles, or are together equal to two right angles. For, if the angle CBA be equal to ABD, each of them is a right angle (Def.
Side 57 - Through a given point to draw a straight line parallel to a given straight line, Let A be the given point, and BC the given straight line : it is required to draw through the point A a straight line parallel to BC.
Side 38 - ... in one and the same straight line. At the point B in the straight line AB, let the two straight lines BC, BD upon the opposite sides of AB, make the adjacent angles ABC, ABD, equal together to two right angles. BD is in the same straight line with CB.
Side 68 - 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.
Side 34 - LET it be granted that a straight line may be drawn from any one point to any other point.
Side 64 - Parallelograms upon the same base, and between the same parallels, are equal to one another.
Side 46 - If one side of a triangle be produced, the exterior angle is greater than either of the interior, and opposite angles.
Side 34 - Things which are equal to the same thing are also equal to one another. 2. If equals be added to equals, the wholes are equal. 3. If equals be subtracted from equals, the remainders are equal.