## Euclid's Elements of Geometry: From the Latin Translation of Commandine, to which is Added, a Treatise of the Nature and Arithmetic of Logarithms ; Likewise Another of the Elements of Plane and Spherical Trigonometry ; with a Preface ...W. Strahan, 1782 - 399 páginas |

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... Plane and Spherical Trigonometry ; by Means whereof , Geometrical

... Plane and Spherical Trigonometry ; by Means whereof , Geometrical

**Magnitudes**are meafured , and their Dimenfions expressed in Numbers . J. KEILL . PREFACE , SHEWING , The USEFULNESS and EXCELLENCY of this Dr. KEILL'S PREFACE . Página 1

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**Magnitude**. II . A Line is Length , without Breadth . III . The Ends ( or Bounds ) of a Line are Points . IV . A Right Line is that which lieth evenly be- tween its Points . V. A Superficies is that which hath only Length and Breadth ... Página 118

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**Magnitudes**are faid to have Proportion to each other , which being multiplied , can exceed one another . · V.**Magnitudes**are faid to be in the fame Ratio , the first to the second , and the third to the fourth ; when the Equimultiples ... Página 119

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**Magnitudes**are in the fame Ra- tio ; the first to the second , as the third to the fourth . VI .**Magnitudes**that have the fame Proportion , are called Proportionals . Expounders ufually lay down here that Definition , for**Magnitudes**... Página 120

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**Magnitudes**B and D. Then ( by Def . 5. ) if 2A be equal to 10B , 2C fhall be equal to 10D . But fince A ( from the ...**Magnitude**D , as A is of B.W.W.D. Thirdly , Let A be equal to any Number of what- foever Parts of B. I fay , C ...### Términos y frases comunes

ABCD adjacent Angles alfo equal alſo Angle ABC Baſe becauſe bifected Centre Circle A B C Circumference Cofine Cone confequently Cylinder defcribed demonftrated Diameter Diſtance drawn equal Angles equiangular Equimultiples faid fame Altitude fame Multiple fame Plane fame Proportion fame Reafon fecond fhall be equal fimilar fince firft folid Parallelopipedon fome fore ftand fubtending given Right Line Gnomon join leffer lefs likewife Logarithm Magnitudes Meaſure Number parallel Parallelogram perpendicular Polygon Prifm Prop PROPOSITION Pyramid Quadrant Ratio Rectangle Rectangle contained remaining Angle Right Angles Right Line A B Right-lined Figure Segment Semicircle ſhall Sides A B Sine Solid Sphere Square Subtangent thefe THEOREM thofe thro tiple Triangle ABC Unity Vertex the Point Wherefore whofe Bafe

### Pasajes populares

Página 193 - 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.

Página xxiii - If two triangles have two sides of the one equal to two sides of the other, each to each ; and have likewise the angles contained by those sides equal to each other; they shall likewise have their bases, or third sides, equal; and the two triangles shall be equal; and their other angles shall be equal, each to each, viz. those to which the equal sides are opposite.

Página 236 - If two triangles have one angle of the one equal to one angle of the other and the sides about these equal angles proportional, the triangles are similar.

Página 11 - ... sides equal to them of the other. Let ABC, DEF be two triangles which have the two sides AB, AC equal to the two sides DE, DF, each to each, viz. AB equal to DE, and AC to DF ; but...

Página 85 - EA : and because AD is equal to DC, and DE common to the triangles ADE, CDE, the two sides AD, DE are equal to the two CD, DE, each to each ; and the angle ADE is equal to the angle CDE, for each of them is a right angle ; therefore the base AE is equal (4.

Página 147 - A straight line is said to be cut in extreme and mean ratio, when the whole is to the greater segment as the greater segment is to the less.

Página 50 - CB, and to twice the rectangle AC, CB: but HF, CK, AG, GE make up the whole figure ADEB, which is the square of AB ; therefore the square of AB is equal to the squares of AC, CB, and twice the rectangle AC, CB. Wherefore, if a straight line be divided, &c.

Página xxv - EF (Hyp.), the two sides GB, BC are equal to the two sides DE, EF, each to each. And the angle GBC is equal to the angle DEF (Hyp.); Therefore the base GC is equal to the base DF (I.

Página xxxiv - ... therefore their other sides are equal, each to each, and the third angle of the one to the third angle of the other (26.

Página 194 - ABC, and they are both in the same plane, which is impossible ; therefore the straight line BC is not above the plane in which are BD and BE: wherefore, the three straight lines BC, BD, BE are in one and the same plane. Therefore, if three straight lines, &c.