The College Euclid: Comprising the First Six and the Parts of the Eleventh and Twelfth Books Read at the Universities ... By A. K. Isbister1865 |
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Page 3
... sides . XXV . An isosceles triangle , is that which has only two sides equal . XXVI . A scalene triangle , is that which has three unequal sides . XXVII . A right - angled triangle , is that which has a right angle , XXVIII . An obtuse ...
... sides . XXV . An isosceles triangle , is that which has only two sides equal . XXVI . A scalene triangle , is that which has three unequal sides . XXVII . A right - angled triangle , is that which has a right angle , XXVIII . An obtuse ...
Page 4
... sides equal . XXXII . A rhombus , is that which has all its sides equal , but its angles are not right angles . XXXIII . A rhomboid , is that which has its opposite sides equal to one another , but all its sides are not equal , nor its ...
... sides equal . XXXII . A rhombus , is that which has all its sides equal , but its angles are not right angles . XXXIII . A rhomboid , is that which has its opposite sides equal to one another , but all its sides are not equal , nor its ...
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 each other : then they shall likewise have their bases , or third sides , equal ; and the two triangles ...
... 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 each other : then they shall likewise have their bases , or third sides , equal ; and the two triangles ...
Page 9
... sides are oppo- site , shall be equal , each to each , viz . the angle ABC to the angle DEF , and the angle ACB to ... sides of the one equal to two sides of the other , & c . Which was to be demonstrated . PROP . V. - THEOREM . The ...
... sides are oppo- site , shall be equal , each to each , viz . the angle ABC to the angle DEF , and the angle ACB to ... sides of the one equal to two sides of the other , & c . Which was to be demonstrated . PROP . V. - THEOREM . The ...
Page 10
... sides be produced , the angles upon the other side of the base shall be equal . ( References - Prop . I. 3 , 4 ; ax . 3. ) Let ABC be an isosceles triangle , of which the side AB is equal to AC , and let the straight lines AB , AC , be ...
... sides be produced , the angles upon the other side of the base shall be equal . ( References - Prop . I. 3 , 4 ; ax . 3. ) Let ABC be an isosceles triangle , of which the side AB is equal to AC , and let the straight lines AB , AC , be ...
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The College Euclid: Comprising the First Six and the Parts of the Eleventh ... Euclides No preview available - 2016 |
Common terms and phrases
ABCD AC is equal adjacent angles angle ABC angle ACB angle BAC angle equal base BC bisect Book centre circle ABC circumference compounded constr DEMONSTRATION diameter double draw Edition English equal angles equal straight lines equal to BC equiangular equilateral and equiangular equimultiples Euclid exterior angle four magnitudes fourth French given circle given point given rectilineal angle given straight line gnomon Grammar greater ratio inscribed isosceles triangle join less Let ABC multiple opposite angles parallel parallelogram pentagon perpendicular plane polygon proportionals proposition Q. E. D. PROP rectangle contained rectilineal figure References-Prop remaining angle right angles segment similar solid angle square of AC straight line AC THEOREM third three straight lines touches the circle triangle ABC twice the rectangle wherefore
Popular passages
Page 140 - 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. either the sides adjacent to the equal...
Page xiv - The straight line drawn at right angles to the diameter of a circle, from the extremity of it, falls without the circle...
Page 310 - 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.
Page 33 - That, if a straight line falling on two straight lines make the interior angles on the same side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on which are the angles less than the two right angles.
Page vi - If a straight line be divided into any two parts, four times the rectangle contained ~by the whole line and one of the parts, together with the square on the other part, is equal to the square on the straight line which is made up of the whole and that part.
Page 310 - 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.
Page xxxvii - The areas of two triangles which have an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles. D c A' D' Hyp. In triangles ABC and A'B'C', ZA = ZA'. To prove AABC = ABxAC. A A'B'C' A'B'xA'C' Proof. Draw the altitudes BD and B'D'.
Page 69 - To divide a given straight line into two parts, so that the rectangle contained by the whole and one of the parts, shall be equal to the square of the other part.
Page 287 - If any point be taken in the diameter of a circle which is not the centre, of all the straight lines which can be drawn from it to the circumference, the greatest is that in which the centre is, and the other part of that diameter is the least...