Elements of Geometry and Trigonometry Translated from the French of A.M. Legendre by David Brewster: Revised and Adapted to the Course of Mathematical Instruction in the United StatesA.S. Barnes & Company, 1849 - 359 Seiten |
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Seite 251
... feet and CB = 672 feet , and also the contained angle ACB = 55 ° 40 ′ : requi- red the distance AB . Ans . 592.967 feet . 6. Being on a horizontal plane , and wanting to ascertain the height of a tower , standing on the top of an ...
... feet and CB = 672 feet , and also the contained angle ACB = 55 ° 40 ′ : requi- red the distance AB . Ans . 592.967 feet . 6. Being on a horizontal plane , and wanting to ascertain the height of a tower , standing on the top of an ...
Seite 274
... feet , we should understand that one square foot is taken for the unit of measure , and that this unit is contained ... feet , it will be most convenient to express the area in square feet ; if the linear dimensions are yards , it will ...
... feet , we should understand that one square foot is taken for the unit of measure , and that this unit is contained ... feet , it will be most convenient to express the area in square feet ; if the linear dimensions are yards , it will ...
Seite 275
... feet . 3. To find the number of square yards in a triangle , whose base is 49 and altitude 25 feet . Ans . 68.736 ) . CASE II . Ans . 663 . When two sides and their included angle are given . RULE . Add together the logarithms of the ...
... feet . 3. To find the number of square yards in a triangle , whose base is 49 and altitude 25 feet . Ans . 68.736 ) . CASE II . Ans . 663 . When two sides and their included angle are given . RULE . Add together the logarithms of the ...
Seite 276
... feet and 21.25 feet , and their included angle 45 ° ? Ans . 20.8694 . CASE III . When the three sides are known . RULE . - 1 . Add the three sides together , and take half their sum 2. From this half - sum subtract each side separately ...
... feet and 21.25 feet , and their included angle 45 ° ? Ans . 20.8694 . CASE III . When the three sides are known . RULE . - 1 . Add the three sides together , and take half their sum 2. From this half - sum subtract each side separately ...
Seite 277
... feet are contained in a plank , whose length is 12 feet 6 inches , the breadth at the greater end 15 inches , and at the less end 11 inches ? Ans . 131 sq . ft . 3. How many square yards are there in a trapezoid , whose parallel sides ...
... feet are contained in a plank , whose length is 12 feet 6 inches , the breadth at the greater end 15 inches , and at the less end 11 inches ? Ans . 131 sq . ft . 3. How many square yards are there in a trapezoid , whose parallel sides ...
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adjacent altitude angle ACB angle BAC ar.-comp base multiplied bisect Book VII centre chord circ circumference circumscribed common cone consequently convex surface cosine Cotang cylinder diagonal diameter dicular distance divided draw drawn equal angles equally distant equations equivalent feet figure find the area formed four right angles frustum given angle given line gles greater homologous sides hypothenuse inscribed circle inscribed polygon intersection less Let ABC logarithm measured by half number of sides opposite parallelogram parallelopipedon pendicular perimeter perpen perpendicular plane MN polyedron polygon ABCDE PROBLEM proportional PROPOSITION pyramid quadrant quadrilateral quantities radii radius ratio rectangle regular polygon right angled triangle Scholium secant segment side BC similar sine slant height solid angle solid described sphere spherical polygon spherical triangle square described straight line tang tangent THEOREM triangle ABC triangular prism vertex
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Seite 241 - In every plane triangle, the sum of two sides is to their difference as the tangent of half the sum of the angles opposite those sides is to the tangent of half their difference.
Seite 251 - Being on a horizontal plane, and wanting to ascertain the height of a tower, standing on the top of an inaccessible hill, there were measured, the angle of elevation of the top of the hill 40°, and of the top of the tower 51° ; then measuring in a direct line 180 feet farther from the hill, the angle of elevation of the top of the tower was 33° 45' ; required the height of the tower.
Seite 109 - The perimeters of two regular polygons of the same number of sides, are to each other as their homologous sides, and their surfaces are to each other as the squares of those sides (Book IV.
Seite 91 - Two similar triangles are to each other as the squares described on their homologous sides. Let ABC, DEF, be two similar triangles, having the angle A equal to D, and The angle B=E.
Seite 169 - THEOREM. 7?/6 convex surface of a cylinder is equal to the circumference of its base multiplied by its altitude.
Seite 41 - 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.
Seite 155 - AK. The two solids AG, AQ, having the same base AEHD are to each other as their altitudes AB, AO ; in like manner, the two solids AQ, AK, having the same base AOLE, are to each other as their altitudes AD, AM. Hence we have the two proportions, sol.
Seite 86 - The areas of two triangles which have an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles. A D A' Hyp. In triangles ABC and A'B'C', To prove AABC A A'B'C' A'B' x A'C ' Proof. Draw the altitudes BD and B'D'.
Seite 282 - ... 1. To find the length of an arc of 30 degrees, the diameter being 18 feet. ' Ans. 4.712364. 2. To find the length of an arc of 12° 10', or 12£°, the diameter being 20 feet.
Seite 93 - ABC : FGH : : ACD : FHI. By the same mode of reasoning, we should find ACD : FHI : : ADE : FIK; and so on, if there were more triangles. And from this series of equal ratios, we conclude that the sum of the antecedents...