Elements of Geometry, Briefly, Yet Plainly Demonstrated by Edmund StoneD. Midwinter, 1728 |
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Page 15
... bc , BC , because they have the fame Bounds , shall agree bor coincide , and so confequently are equal . b 8 ax ... Bafe BE = DC . Also EC isf DB . Whence in the Triangles f 3 ax . BCE , BDC , the Angle ECB shall be = DBC , ( which ...
... bc , BC , because they have the fame Bounds , shall agree bor coincide , and so confequently are equal . b 8 ax ... Bafe BE = DC . Also EC isf DB . Whence in the Triangles f 3 ax . BCE , BDC , the Angle ECB shall be = DBC , ( which ...
Page 17
... BC , then shall the c fup . be = ECD . Therefore the An - d 9ax . -ACD ; that is , the Angle FDC which is abfurd ... Bafe bc ; then the Angles con- - the equal right Lines shall be equal , viz . A a 1 b C Because AB = ab , and AC ...
... BC , then shall the c fup . be = ECD . Therefore the An - d 9ax . -ACD ; that is , the Angle FDC which is abfurd ... Bafe bc ; then the Angles con- - the equal right Lines shall be equal , viz . A a 1 b C Because AB = ab , and AC ...
Page 22
... BC ; in which continu'd out take FEF 3. All th ВЕ , and those t the Bafe , a and HI = AH , and join FC , IC , and continue Out ACG . Now because CEg = EA , and EF8 = EB , and Angle FEC == BEA ; the Angle ECF shall De EAB . In like ...
... BC ; in which continu'd out take FEF 3. All th ВЕ , and those t the Bafe , a and HI = AH , and join FC , IC , and continue Out ACG . Now because CEg = EA , and EF8 = EB , and Angle FEC == BEA ; the Angle ECF shall De EAB . In like ...
Page 27
Euclid. Cafe 2. When the Base bg coincides with bc , then it is plain that bg ( BC ) be . a 9 ax . Cafe 3. But when bg falls below bc , because ag + gbb ac + cb ; if from both fides youb 21. 1 . take away the equal Lines ag , ac , there ...
Euclid. Cafe 2. When the Base bg coincides with bc , then it is plain that bg ( BC ) be . a 9 ax . Cafe 3. But when bg falls below bc , because ag + gbb ac + cb ; if from both fides youb 21. 1 . take away the equal Lines ag , ac , there ...
Page 35
... Bafe BC , and between the Same Parallels AF , BC , are equal the one to the other . A G D E F B C 29.1 . For AD = BC = EF , add DE common a 34. 1 . to both : then AE = DF : but alfo AB = b 2 ax . DC , and the Ang . A = CDE : therefore ...
... Bafe BC , and between the Same Parallels AF , BC , are equal the one to the other . A G D E F B C 29.1 . For AD = BC = EF , add DE common a 34. 1 . to both : then AE = DF : but alfo AB = b 2 ax . DC , and the Ang . A = CDE : therefore ...
Common terms and phrases
9 ax ABCD abfurd alfo alſo Altitude Angle ABC Bafe Baſe Base BC becauſe biſect Center Circ Circle Circumference Cone conft Conſequent COROL Cylinder demonſtrated deſcribed Diameter draw the right drawn EFGH equal Angles equiangular equilateral Equimultiples faid fame fimilar fince firſt folid fore four right given right Line gles Gnomon greater Hence leſs likewiſe Line CD Magnitudes manifeſt Number oppofite parallel Parallelepip Parallelepipedons Parallelogram perpend perpendicular Point Polyhedron Priſm Probl Proportion Pyramids Q. E. D. PROP Ratio Reaſon Rectangle right Angles right Line AB right Line AC right-lined Figure ſaid ſame ſay SCHOL SCHOLIU ſecond Segment ſhall Side BC ſince ſome Sphere Square ſtand ſuppoſe theſe thoſe tiple Triangle ABC triplicate Whence whole whoſe
Popular passages
Page 29 - 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.
Page 143 - Equal triangles which have one angle of the one equal to one angle of the other, have their sides about the equal angles reciprocally proportional : And triangles which have one angle in the one equal to one angle in the other, and their sides about the equal angles reciprocally proportional, are equal to one another.
Page 31 - ABD, is equal* to two right angles, «13. 1. therefore all the interior, together with all the exterior angles of the figure, are equal to twice as many right angles as there are sides of the figure; that is, by the foregoing corollary, they are equal to all the interior angles of the figure, together with four right angles; therefore all the exterior angles are equal to four right angles.
Page 25 - If two right-angled triangles have their hypotenuses equal, and one side of the one equal to one side of the other, the triangles are congruent.
Page 29 - The three angles of any triangle taken together are equal to the three angles of any other triangle taken together. From whence it follows, 2.
Page 217 - ... to one of the consequents, so are all the antecedents to all the consequents ; [V. 12] hence the whole polyhedral solid in the sphere about A as centre has to the whole polyhedral solid in the other sphere the ratio triplicate of that which AB has to the radius of the other sphere, that is, of that which the diameter BD has to the diameter of the other sphere. QED This proposition is of great length and therefore requires summarising in order to make it easier to grasp. Moreover there are some...
Page 9 - That a straight line may be drawn from any point to any other point. 2. That a straight line may be produced to any length in a straight line.
Page 217 - And as one antecedent is to its confequent, fo are all the antecedents to all the confequents. Wherefore the whole folid polyhedron in the greater fphere has to the whole folid polyhedron in the other, the triplicate ratio of that which AB...
Page 217 - Center is A, to every one of the Pyramids of the fame Order in the other Sphere, hath a triplicate Proportion of that which AB has to that Line drawn from the Center of the other Sphere.