Elements of Geometry: Containing the First Six Books of Euclid, with a Supplement of the Quadrature of the Circle and the Geometry of Solids |
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Page 251
... solid , & c . Q. E. D. PROP . III . THEOR . ( IF a solid parallelepiped be cut by a plane parallel to two of its opposite planes , it will be divided into two solids , which will be to each other as their bases . Let the solid ...
... solid , & c . Q. E. D. PROP . III . THEOR . ( IF a solid parallelepiped be cut by a plane parallel to two of its opposite planes , it will be divided into two solids , which will be to each other as their bases . Let the solid ...
Page 252
... solid LP are equal and similar to three planes of the so- lid KR , and also to three planes of the solid AV . But the three planes opposite to these three are equal and similar to theme in ... solid parallelepiped , and DE 252 ELEMENTS.
... solid LP are equal and similar to three planes of the so- lid KR , and also to three planes of the solid AV . But the three planes opposite to these three are equal and similar to theme in ... solid parallelepiped , and DE 252 ELEMENTS.
Page 253
... Solids John Playfair. J Let AB be a solid parallelepiped , and DE , CF the diago- Book III . nals of the opposite parallelograms AH , GB , viz . those which are drawn between the equal angles in each . Because CD , FE are parallel to GA ...
... Solids John Playfair. J Let AB be a solid parallelepiped , and DE , CF the diago- Book III . nals of the opposite parallelograms AH , GB , viz . those which are drawn between the equal angles in each . Because CD , FE are parallel to GA ...
Page 254
... parallelepipeds , & c . Q. E. D. PROP . VI . THEOR . 1 SOLID parallelepipeds upon the same base and of the same altitude , the insisting straight lines of which are not terminated in the same straight lines in the plane opposite to the ...
... parallelepipeds , & c . Q. E. D. PROP . VI . THEOR . 1 SOLID parallelepipeds upon the same base and of the same altitude , the insisting straight lines of which are not terminated in the same straight lines in the plane opposite to the ...
Page 255
... solid CP is a parallelepiped . Now the solid parallelepiped CM is equal to the solid parallelepiped CP , b 5. 3. Sup . because they are upon the same base , and their insisting straight lines ... SOLID parallelepipeds OF GEOMETRY . 255.
... solid CP is a parallelepiped . Now the solid parallelepiped CM is equal to the solid parallelepiped CP , b 5. 3. Sup . because they are upon the same base , and their insisting straight lines ... SOLID parallelepipeds OF GEOMETRY . 255.
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Common terms and phrases
ABC is equal altitude angle ABC angle ACB angle BAC angle contained angle EDF arch base BC bisected Book centre circle ABC circumference coincide common section cylinder definition demonstrated diameter draw drawa equal angles equiangular equilateral polygon equimultiples Euclid exterior angle fore four right angles given circle given straight line greater inscribed interior and opposite join less Let ABC Let the straight meet multiple opposite angle parallelogram parallelogram ABCD perpendicular point F polygon prism PROB produced proportional proposition pyramid Q. E. D. COR Q. E. D. PROP ratio rectangle contained rectilineal figure remaining angle segment solid angle solid parallelepipeds straight line AB straight line AC Suppl THEOR third touches the circle triangle ABC triangle DEF
Popular passages
Page 121 - 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. either the sides adjacent to the equal...
Page 42 - TO a given straight line to apply a parallelogram, which shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.
Page 63 - Therefore, in obtuse-angled triangles, &c. QED PROP. XIII. THEOREM. In every triangle, the square of the side subtending either of the acute angles is less than the squares of the sides containing that angle, by twice the rectangle contained by either of these sides, and the straight line intercepted between the perpendicular let fall upon it from the opposite angle, and the acute angle.
Page 3 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.
Page 183 - Equiangular parallelograms have to one another the ratio which is compounded of the ratios of their sides. Let AC, CF be equiangular parallelograms having the angle BCD equal to the angle ECG ; the ratio of the parallelogram AC to the parallelogram CF is the same with the ratio which is compounded •f the ratios of their sides.
Page 3 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Page 291 - 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.
Page 160 - ... extremities of the base shall have the same ratio which the other sides of the triangle have to one...
Page 10 - ... shall be greater than the base of the other. Let ABC, DEF be two triangles, which have the two sides AB, AC, equal to the two DE, DF, each to each, viz.
Page 14 - Therefore, upon the same base, and on the same side of it, there cannot be two triangles that have their sides which are terminated in one extremity of the base equal to one another, and likewise those which are terminated in the other extretnity equal to one another.