A school Euclid, being books i. & ii. of Euclid's Elements, with notes by C. Mansford1874 |
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Σελίδα 15
... triangles , by three straight lines . 22. Quadrilateral figures by four straight lines . 23. Multilateral figures , or polygons , by more than four straight lines . 24. Of three - sided figures an equilateral triangle is that which has ...
... triangles , by three straight lines . 22. Quadrilateral figures by four straight lines . 23. Multilateral figures , or polygons , by more than four straight lines . 24. Of three - sided figures an equilateral triangle is that which has ...
Σελίδα 18
... . 11. All right angles are equal to one another . 12. Two straight lines which cut one another cannot both be parallel to a third straight line . PROPOSITION 1. PROBLEM . To describe an equilateral triangle on 18 EUCLID'S ELEMENTS .
... . 11. All right angles are equal to one another . 12. Two straight lines which cut one another cannot both be parallel to a third straight line . PROPOSITION 1. PROBLEM . To describe an equilateral triangle on 18 EUCLID'S ELEMENTS .
Σελίδα 19
Euclides Charles Mansford. PROPOSITION 1. PROBLEM . To describe an equilateral triangle on a given finite straight line . 1 . It is re- Let AB be the given straight line . quired to describe an equilateral triangle on AB . From the ...
Euclides Charles Mansford. PROPOSITION 1. PROBLEM . To describe an equilateral triangle on a given finite straight line . 1 . It is re- Let AB be the given straight line . quired to describe an equilateral triangle on AB . From the ...
Σελίδα 20
... equilateral triangle DAB , [ I. 1. ] and produce the straight lines DA , DB to E and F. [ Post . 2. ] From the centre B , at the dis- tance BC , describe the circle CGH , meeting DF in G. Post . 3. ] From the centre D , at the dis ...
... equilateral triangle DAB , [ I. 1. ] and produce the straight lines DA , DB to E and F. [ Post . 2. ] From the centre B , at the dis- tance BC , describe the circle CGH , meeting DF in G. Post . 3. ] From the centre D , at the dis ...
Σελίδα 21
Euclides Charles Mansford. 2. The equilateral triangle may be described on either side of these two lines , giving four equilateral triangles . 3. In each of these possible triangles the sides may be pro- duced either through the vertex ...
Euclides Charles Mansford. 2. The equilateral triangle may be described on either side of these two lines , giving four equilateral triangles . 3. In each of these possible triangles the sides may be pro- duced either through the vertex ...
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A School Euclid, Being Books I. & II. of Euclid's Elements, with Notes by C ... Euclides Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2015 |
Συχνά εμφανιζόμενοι όροι και φράσεις
AC is equal adjacent angles alternate angles angle ABC angle ACB angle AGH angle BAC angle BCD angle DBA angle EDF angle equal angles are equal axioms base BC bisect centre circle coincide Const diagonals diameter double equal sides equal to BC equal to twice equilateral triangle Euclid EUCLID'S ELEMENTS exterior angle fore four right angles given point given rectilineal angle given straight line gnomon half a right hypotenuse interior and opposite isosceles triangle join Let ABC Let the straight obtuse opposite angle opposite sides parallel to CD parallelogram parallelogram ABCD perpendicular produced prop quadrilateral rectangle AC rectangle contained remaining angle rhombus right angles right-angled triangle shew side BC sides equal square described square on AC THEOREM third angle triangle ABC triangle DEF truths twice the rectangle unequal
Δημοφιλή αποσπάσματα
Σελίδα 90 - If a straight line be divided into any two parts, the squares of the whole line, and of one of the parts, are equal to twice the rectangle contained by the whole and that part, together with the square of the other part.
Σελίδα 28 - If two triangles have two sides of the one equal to two sides of the...
Σελίδα 41 - Any two sides of a triangle are together greater than the third side.
Σελίδα 57 - 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.
Σελίδα 72 - To describe a parallelogram equal to a given rectilineal figure, and having an angle equal to a given rectilineal angle. Let ABCD be the given rectilineal figure, and E the given rectilineal angle. It is required to describe a parallelogram equal to ABCD, and having an angle equal to E.
Σελίδα 75 - 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.
Σελίδα 89 - 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...
Σελίδα 55 - IF a straight line fall upon two parallel straight lines, it makes the alternate angles equal to one another; and the exterior angle equal to the interior and opposite upon the same side; and likewise the two interior angles upon the same side together equal to two right angles...
Σελίδα 28 - A two triangles, having the two sides AB, AC, equal to the two sides \ DE, DF, each to each, viz: AB to DE, and AC to DF; and also the base BC equal to the base EF.
Σελίδα 69 - To a given straight line to apply a parallelogram, which shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.