The First Book of Euclid's Elements: Arranged for BeginnersMacMillan, 1892 - 167 σελίδες |
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Σελίδα
... proof that in the opinion of many some of the methods adopted in the past for the teaching Geometry in England have been unsatisfactory . This Association has I believe done much to point out the defects of our Geometrical teaching ...
... proof that in the opinion of many some of the methods adopted in the past for the teaching Geometry in England have been unsatisfactory . This Association has I believe done much to point out the defects of our Geometrical teaching ...
Σελίδα
... proof given on page 24 is sound , and independent of Proposition 22 . One advantage of dividing the Theorems from the Problems is this . The figures of the Theorems should be sketched and should be considered only as pictures , while ...
... proof given on page 24 is sound , and independent of Proposition 22 . One advantage of dividing the Theorems from the Problems is this . The figures of the Theorems should be sketched and should be considered only as pictures , while ...
Σελίδα 19
... proof of a Geometrical State- ment , or Theorem , it is usual to put the letters Q.E.D. i.e. Quod erat demonstrandum , ' which was to be proved . ' Proposition 4 . 49. If two triangles have two sides 2-2 EQUAL TRIANGLES . 19.
... proof of a Geometrical State- ment , or Theorem , it is usual to put the letters Q.E.D. i.e. Quod erat demonstrandum , ' which was to be proved . ' Proposition 4 . 49. If two triangles have two sides 2-2 EQUAL TRIANGLES . 19.
Σελίδα 25
... angle LFE can be made to coincide with GBC , and is therefore equal to it . But the angle LFE is equal to HCB ; therefore the angle GBC is equal to the angle HCB . Q.E.D. Euclid's Proof of Prop . 5 . 53. The angles PROPOSITION 5 . 25.
... angle LFE can be made to coincide with GBC , and is therefore equal to it . But the angle LFE is equal to HCB ; therefore the angle GBC is equal to the angle HCB . Q.E.D. Euclid's Proof of Prop . 5 . 53. The angles PROPOSITION 5 . 25.
Σελίδα 26
Arranged for Beginners Euclid, John Bascombe Lock. Euclid's Proof of Prop . 5 . 53. The angles at the base of an isosceles triangle are equal ; also , if the equal sides are produced , the angles on the ... proof of Prop . 5 , on 26 EUCLID .
Arranged for Beginners Euclid, John Bascombe Lock. Euclid's Proof of Prop . 5 . 53. The angles at the base of an isosceles triangle are equal ; also , if the equal sides are produced , the angles on the ... proof of Prop . 5 , on 26 EUCLID .
Συχνά εμφανιζόμενοι όροι και φράσεις
ABC is equal adjacent angles alternate angles angle ABC angle ACB angle BAC angle equal angles FAB angular point area of ABC base BC bisectors bisects the angle centre coincide Consider the triangles Construction corresponding angle DEF are equal describe a triangle diagonal equal angles equal area equal in area equal respectively equal to BC equidistant equilateral triangle exterior angle finite straight line given angle given finite straight given parallelogram given point given straight line given triangle greater included angle interior opposite angle intersect isosceles triangle line BC middle point opposite sides perpendicular plane produced Prop Proposition Q.E.D. EXAMPLES quadrilateral radius rectilineal figure required to prove rhombus right angles right-angled triangle Shew side BC sides equal square straight angle surface third side triangle ABC triangle DEF triangles are equal Wherefore
Δημοφιλή αποσπάσματα
Σελίδα 28 - 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.
Σελίδα 72 - 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 48 - From the greater of two given straight lines to cut off a part equal to the less. Let AB and C be the two given straight lines, whereof AB is the greater.
Σελίδα 151 - To draw a straight line through a given point parallel to a given straight line. Let A be the given point, and BC the given straight line ; it is required to draw a straight line through the point A, parallel to the straight hue BC.
Σελίδα 118 - THE straight lines which join the extremities of two equal and parallel straight lines, towards the same parts, are also themselves equal and parallel.
Σελίδα 149 - ... is equal to the sum of the areas of the squares on the other two sides.
Σελίδα 114 - 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.
Σελίδα 135 - DE : but equal triangles on the same base and on the same side of it, are between the same parallels ; (i.
Σελίδα 125 - The line joining the middle points of two sides of a triangle is parallel to the third side and equal to half of the third side.
Σελίδα 54 - To draw a straight line at right angles to a given straight line, from a given point in the same.