The Elements of geometry; or, The first six books, with the eleventh and twelfth, of Euclid, with corrections, annotations, and exercises, by R. Wallace. Cassell's ed1855 |
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Page 4
... sides . XXVII . A right - angled triangle is that which as a right angle . XXVIII . An obtuse - angled triangle is ... sides equal , and all its angles right angles . This definition is redundant . If the general definition annexed to ...
... sides . XXVII . A right - angled triangle is that which as a right angle . XXVIII . An obtuse - angled triangle is ... sides equal , and all its angles right angles . This definition is redundant . If the general definition annexed to ...
Page 8
... sides of the one equal to two sides of the other , each to each , and have likewise the angles contained by these sides equal to one another , their bases , or third sides , are equal ; the two triangles are equal ; and their other ...
... sides of the one equal to two sides of the other , each to each , and have likewise the angles contained by these sides equal to one another , their bases , or third sides , are equal ; the two triangles are equal ; and their other ...
Page 9
... sides , of the one triangle is the same as that contained by the two sides of the other ; as , in the triangles FAC , GAB , see fig . to next proposition ; or , when the triangles have a common base , as in the triangles FBC , GCB , see ...
... sides , of the one triangle is the same as that contained by the two sides of the other ; as , in the triangles FAC , GAB , see fig . to next proposition ; or , when the triangles have a common base , as in the triangles FBC , GCB , see ...
Page 10
... sides BF , FC are equal to the two sides CG , GB , each to each . And the angle BFC was proved to be equal to the angle CG B. Wherefore the two triangles BFC , CGB , are equal ( I. 4 ) , and their remaining angles are equal , each to ...
... sides BF , FC are equal to the two sides CG , GB , each to each . And the angle BFC was proved to be equal to the angle CG B. Wherefore the two triangles BFC , CGB , are equal ( I. 4 ) , and their remaining angles are equal , each to ...
Page 11
... side of it , let there be two triangles ACB , ADB , having their sides CA , DA terminated in the extremity A of the base , equal to one another , and likewise their sides , CB , DB , terminated in the extremity B. A C D B Join CD ...
... side of it , let there be two triangles ACB , ADB , having their sides CA , DA terminated in the extremity A of the base , equal to one another , and likewise their sides , CB , DB , terminated in the extremity B. A C D B Join CD ...
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The Elements of Geometry: Or, the First Six Books, with the Eleventh and ... Euclides No preview available - 2016 |
Common terms and phrases
ABC is equal ABCD adjacent angles altitude angle ABC angle ACB angle BAC angle DEF angle EDF base BC bisected centre circle ABC circumference cone cylinder described diagonal diameter draw duplicate ratio equal angles equal Ax equal Const equiangular equimultiples Euclid ex æquali Exercise exterior angle fore given straight line gnomon homologous sides inscribed join less meet multiple opposite angle parallelogram parallelogram AC parallelopiped pentagon perpendicular polygon prism produced proposition Q. E. D. PROP reciprocally proportional rectangle contained rectilineal figure remaining angle right angles segment similar triangles solid angle sphere squares of AC straight line drawn straight lines A B THEOREM third three plane angles three straight lines triangle ABC triangle DEF triplicate ratio twice the rectangle vertex Wherefore whole angle
Popular passages
Page 23 - 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 34 - If there be two straight lines, one of which is divided into any number of parts, the rectangle contained by the two straight lines is equal to the rectangles contained by the undivided line, and the several parts of the divided line.
Page 2 - 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 122 - 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 5 - LET it be granted that a straight line may be drawn from any one point to any other point.
Page 3 - 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.
Page 135 - Two triangles, which have an angle of the one equal to an angle of the other, and the sides containing those angles proportional, are similar.
Page 20 - PROBLEM. At a given point in a given straight line, to make a rectilineal angle equal to a given rectilineal angle.
Page 147 - Similar solid figures are such as have all their solid angles equal, each to each, and are contained by the same number of similar planes.
Page 37 - 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, together with the square...