Elements of Geometry: On the Basis of Dr. Brewster's Legendre : to which is Added a Book on Proportion, with Notes and Illustrations |
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Page 10
... reason , it is unsurpassed by any other work with which I am acquainted . buro Lyceum . I cheerfully concur in the recommen- dation of Messrs . Hopkins and Rudd.- Having used the work for nearly two terms in the Auburn Lyceum , of which ...
... reason , it is unsurpassed by any other work with which I am acquainted . buro Lyceum . I cheerfully concur in the recommen- dation of Messrs . Hopkins and Rudd.- Having used the work for nearly two terms in the Auburn Lyceum , of which ...
Page 11
... reason why Algebra should not be much more generally taught than it is at present ; it is minently useful and this work will greatly facilitate its introduction even into our common schools throughout the country . under the most ...
... reason why Algebra should not be much more generally taught than it is at present ; it is minently useful and this work will greatly facilitate its introduction even into our common schools throughout the country . under the most ...
Page 12
... reason- ing , which were ever invented by human ingenuity . The mind , therefore , whose powers have been trained to such accuracy , and whose habits of reasoning have been formed upon such a model , cannot fail to master any subject ...
... reason- ing , which were ever invented by human ingenuity . The mind , therefore , whose powers have been trained to such accuracy , and whose habits of reasoning have been formed upon such a model , cannot fail to master any subject ...
Page 12
... reasons or proofs , which establish its cor- rectness ? Here much time and energy are often wasted , and a lasting disgust ... reason for each successive step . He is now prepared to deduce from the particular demonstration the general ...
... reasons or proofs , which establish its cor- rectness ? Here much time and energy are often wasted , and a lasting disgust ... reason for each successive step . He is now prepared to deduce from the particular demonstration the general ...
Page 41
... reason be perpendicular to CD . Hence AB and CD are per- E R C -D Q B pendicular to the same straight line ; therefore , ( Prop . 18 , ) they are parallel . Hence , Any two straight lines which are parallel to a third line , are ...
... reason be perpendicular to CD . Hence AB and CD are per- E R C -D Q B pendicular to the same straight line ; therefore , ( Prop . 18 , ) they are parallel . Hence , Any two straight lines which are parallel to a third line , are ...
Common terms and phrases
Abridgment of Day's adjacent angles allel altitude angle ACB angle BAC antecedent base ABCD bisect centre chord circ circle circumference circumscribed polygon common cone consequently convex surface couplets cylinder Day's Algebra diagonal diameter divided draw drawn equal and parallel equal angles equally distant equiangular equilateral triangles equivalent four magnitudes frustum geometry greater half homologous sides hypothenuse hypothesis inscribed polygon interior angles intersection let fall manner mean proportional measured number of sides oblique lines opposite parallelogram pendicular perimeter perpendicular plane angles plane MN polyedron polygon ABCDE President Day prism PROBLEM Prop PROPOSITION XI pyramid SABCDE quadrilateral quantity radii radius ratio rectangle regular polygon respectively equal SABC Scholium Schools and Academies segment similar solid angle sphere square described straight line tangent THEOREM Thomson trapezium triangle ABC triangular prism vertex Yale College
Popular passages
Page 196 - THEOREM. Every section of a sphere, made by a plane, is a circle.
Page 176 - AT into equal parts .Ax, xy, yz, &c., each less than Aa, and let k be one of those parts : through the points of division pass planes parallel to the plane of the bases : the corresponding sections formed by these planes in the two pyramids will be respectively equivalent, namely, DEF to def, GHI to ghi, &c.
Page 125 - AB as a diameter, describe a semicircle : at the extremity of the diameter draw the tangent AD, equal to the side of the square C ; through the point D and the centre O draw the secant DF ; then will DE and DF be the adjacent sides of the rectangle required. For...
Page 229 - The area of the circle, we infer therefore, is equal to 3.1415926. Some doubt may exist perhaps about the last decimal figure, owing to errors proceeding from the parts omitted ; but the calculation has been carried on with an additional figure, that the final result here given might be absolutely correct even to the last decimal place. Since the...
Page 118 - B, may be found in the same manner, for it will be the same as a fourth proportional to the three lines A, B, B. PROBLEM IIL To find a mean proportional between two given lines A and B.
Page 176 - DEF, def, are equivalent; for like reasons, the third exterior prism GHI-K and the second interior prism ghi-d are equivalent; the fourth exterior and the third interior ; and so on, to the last in each series. Hence all the exterior prisms of the pyramid...
Page 46 - CIRCLE is a plane figure bounded by a curved line, all the points of which are equally distant from a point within called the centre; as the figure ADB E.
Page 220 - Let it be granted that a straight line may be drawn from any one point to any other point.
Page 101 - 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 acute angle and the perpendicular let fall upon it from the opposite angle.
Page 227 - The surface of a regular inscribed polygon, and that of a similar polygon circumscribed, being given ; to find the surfaces of the regular inscribed and circumscribed polygons having double the number of sides. Let AB be a side of the given inscribed polygon ; EF, parallel to AB, a side of the circumscribed polygon ; C the centre of the circle. If the chord AM and the tangents AP, BQ, be drawn, AM...