Elements of Geometry: Being Chiefly a Selection from Playfair's Geometry |
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Page 29
... angle equal to the three sides of the other , each to oach , they are equal in all respects . Let ABC , DEF be two ... BAC is equal to the whole angle BGC . But the angle BGC is , by hypothesis , equal to the angle EDF ; therefore also ...
... angle equal to the three sides of the other , each to oach , they are equal in all respects . Let ABC , DEF be two ... BAC is equal to the whole angle BGC . But the angle BGC is , by hypothesis , equal to the angle EDF ; therefore also ...
Page 30
... angle BAC . Because AD is equal to AE , and AF is common to the two triangles DAF , EAF , and DF is equal to EF ; the angle DAF is equal to EAF ( 8. 1. ) ; where- fore the angle BAC is bisect- ed by the straight line AF . Which was to ...
... angle BAC . Because AD is equal to AE , and AF is common to the two triangles DAF , EAF , and DF is equal to EF ; the angle DAF is equal to EAF ( 8. 1. ) ; where- fore the angle BAC is bisect- ed by the straight line AF . Which was to ...
Page 35
... angle will be greater than either of the interior and opposite angles . Let ABC be a triangle and let one side BC be produced to D ; the exterior angle ACD is greater than either of the inte- rior opposite angles CBA , BAC . Bisect AC ...
... angle will be greater than either of the interior and opposite angles . Let ABC be a triangle and let one side BC be produced to D ; the exterior angle ACD is greater than either of the inte- rior opposite angles CBA , BAC . Bisect AC ...
Page 43
... BAC , ACE are e- qual ( Prop . 29. ) ; and be- cause AB is parallel to B A € CE , and BD meets them , the exterior angle ECD is equal to the interior and opposite angle B. Hence the whole exterior angle ACD is equal to the two interior ...
... BAC , ACE are e- qual ( Prop . 29. ) ; and be- cause AB is parallel to B A € CE , and BD meets them , the exterior angle ECD is equal to the interior and opposite angle B. Hence the whole exterior angle ACD is equal to the two interior ...
Page 51
... angle be parallel to the sides of another angle , each to each , and be directed the same way , the angles are equal to each other . Let the sides AC , AB of the angle BAC be parallel to the sides ED , EF of the angle DEF , each to each ; ...
... angle be parallel to the sides of another angle , each to each , and be directed the same way , the angles are equal to each other . Let the sides AC , AB of the angle BAC be parallel to the sides ED , EF of the angle DEF , each to each ; ...
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Elements of Geometry: Being Chiefly a Selection From Playfair's Geometry John Playfair No preview available - 2023 |
Elements of Geometry: Being Chiefly a Selection From Playfair's Geometry John Playfair No preview available - 2023 |
Common terms and phrases
ABC is equal ABCD alternate angles angle ABC angle ACB angle BAC angles AGH angles equal base ABC bases and altitudes bisect centre chord circumference cone Consequently cylinder demonstrations described diagonals diameter divided draw equal angles equal arches equal bases equal circles equal to AC equiangular Euclid's Euclid's Elements exterior angle fore four quantities four right angles geometry given point given straight line gles greater Hence homologous sides intersect KLMN Let ABC meet opposite angles opposite side paral parallel lines parallel to CD parallelogram parallelopipeds perp perpendicular plane polygon prism Prop pyramid Q. E. D. COR Q. E. D. PROPOSITION radius rectangle contained right angled triangle Scholium segments semicircle side AC similar similar triangles solid square straight line &c subtended tangent THEOREM triangle ABC vertex wherefore
Popular passages
Page 36 - Any two sides of a triangle are together greater than the third side.
Page 80 - If a straight line be divided into any two parts, the square of the whole line is equal to the squares of the two parts, together with twice the rectangle contained by the parts.
Page 42 - 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...
Page 30 - To bisect a given finite straight line, that is, to divide it into two equal parts. Let AB be the given straight line : it is required to divide it intotwo equal parts.
Page 20 - LET it be granted that a straight line may be drawn from any one point to any other point.
Page 38 - Problem. At a given point in a given straight line to make a rectilineal angle equal to a given rectilineal angle.
Page 113 - Wherefore also the angle BAD is equal to the angle CAD : Therefore the angle BAC is cut into two equal angles by the straight line AD.
Page 24 - DE ; the point B shall coincide with the point E, because AB is equal to DE; and AB coinciding with DE, AC shall coincide...
Page 36 - The greater angle of every triangle is subtended by the greater side, or has the greater side opposite to it.