A companion to Euclid: being a help to the understanding and remembering of the first four books. With a set of improved figures, and an original demonstration of the proposition called in Euclid the twelfth axiom, by a graduateJohn W. Parker, 1837 - 88 σελίδες |
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Αποτελέσματα 1 - 5 από τα 14.
Σελίδα 8
Euclides. book ; but he will find that by making first the given line , then the given point , & c . , according to the ... whole of them to memory before reading a single proposition . One of the first things of which it is important to ...
Euclides. book ; but he will find that by making first the given line , then the given point , & c . , according to the ... whole of them to memory before reading a single proposition . One of the first things of which it is important to ...
Σελίδα 30
... line MN are together equal to 2 right Ꭰ E C M N Zs ( by Prop . XIII . 1. ) , and also the s below MN are together equal to 2 rights ( by the same Proposi- tion . ) Hence all the ZS EFM + DFE + CFD + NFC + BFN + AFB + MFA = 4 rights ...
... line MN are together equal to 2 right Ꭰ E C M N Zs ( by Prop . XIII . 1. ) , and also the s below MN are together equal to 2 rights ( by the same Proposi- tion . ) Hence all the ZS EFM + DFE + CFD + NFC + BFN + AFB + MFA = 4 rights ...
Σελίδα 34
... line , and towards the same parts , are between the same parallels . B D C E Steps of the Demonstration . Suppose that AD is not || BF , but that some other line ... whole △ 34 FIRST BOOK .
... line , and towards the same parts , are between the same parallels . B D C E Steps of the Demonstration . Suppose that AD is not || BF , but that some other line ... whole △ 34 FIRST BOOK .
Σελίδα 35
Euclides. Steps of the Demonstration . 1. Prove that whole △ ABC = 2 △ ACE , 2 . that FCA ABC ( and it has CEF = ZD by ... line to apply a pa- rallelogram which shall be equal to a given triangle , and have one of its angles equal to a ...
Euclides. Steps of the Demonstration . 1. Prove that whole △ ABC = 2 △ ACE , 2 . that FCA ABC ( and it has CEF = ZD by ... line to apply a pa- rallelogram which shall be equal to a given triangle , and have one of its angles equal to a ...
Σελίδα 36
... line . in order to prove , ( In a similar manner it must be proved that FG , GL are in one right line . ) Also that FM is a m . The Demonstration itself is merely the showing from the construction that the whole whole rectilineal figure ...
... line . in order to prove , ( In a similar manner it must be proved that FG , GL are in one right line . ) Also that FM is a m . The Demonstration itself is merely the showing from the construction that the whole whole rectilineal figure ...
Συχνά εμφανιζόμενοι όροι και φράσεις
AB² AC² AD² AEX EC angle contained angle equal Argument ad absurdum base DF BC² BD² bisect CB² cuts the circle DC² Demonstration itself consists diameter EB² EF² EG² Engravings equal straight lines equi equiangular equilateral Euclid F Steps fall figure GF² given circle given point given rectilineal angle given straight line given triangle i. e. less inscribe interior angles learner less greater line be divided line drawn parallel parallelogram PARKER pass pentagon point of contact Problem proof PROPOSITION IX PROPOSITION VIII Proved by showing rectangle contained right angles right line shows the supposition similarly Suppose supposition is false Theorem WEST STRAND whole line
Δημοφιλή αποσπάσματα
Σελίδα 24 - 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, namely, either t}le sides adjacent to the equal...
Σελίδα 45 - 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.
Σελίδα 18 - If, at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line.
Σελίδα 61 - From this it is manifest that the straight line which is drawn at right angles to the diameter of a circle from the extremity of it, touches the circle...
Σελίδα 37 - 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 76 - IF from any point without a circle two straight lines be drawn, one of which cuts the circle, and the other touches it ; the rectangle contained by the whole line which cuts the circle, and the part of it without the circle, shall be equal to the square of the line which touches it.
Σελίδα 77 - If from a point without a circle there be drawn two straight lines, one of which cuts the circle, and the other meets it, and if the rectangle contained by the whole line which cuts the circle, and the part of it without the circle, be equal to the square on GEOMETRY.
Σελίδα 72 - If a straight line touch a circle, and from the point of contact a straight line be drawn at right angles to the touching line, the centre of the circle shall be in that line.
Σελίδα 27 - If a straight line fall on two parallel straight lines, it makes the alternate angles equal to one another, and the exterior angle equal to the interior and opposite angle on the same side; and also the two interior angles on the same side together equal to two right angles.