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ABCD acres altitude base called centre chains chord circle circle whose diameter circumference column common cone consequently contain convex surface cosine cubic cylinder decimal described diagonal diameter difference distance divide draw drawn entire equal equivalent EXAMPLES feet figure find the area follows formed four frustum given gives greater half hence hexagon horizontal inches included inscribed intersection length less logarithm measured meet Mensuration of Surfaces minutes Multiply opposite parallel parallelogram pass perimeter perpendicular places plane polygon prism PROBLEM proportion pyramid quadrilateral radius ratio rectangle regular remaining Required the area right angles RULE scale seconds side similar sine slant height solidity sphere square straight line suppose surface taken tangent THEOREM third triangle triangle ABC unit viii yards
Page 58 - After remarking that the mathematician positively knows that the sum of the three angles of a triangle is equal to two right angles...
Page 78 - If two triangles have two sides and the included angle of the one, equal to two sides and the included angle of the other, each to each, the two triangles will be equal in all their parts." Axiom 1. "Things which are equal to the same thing, are equal to each other.
Page 121 - A zone is a portion of the surface of a sphere, included between two parallel planes which form its bases.
Page 121 - If a pyramid with a polygon for its base be cut by a plane parallel to the base, the section will be a polygon similar to the base.
Page 32 - Hence, the interior angles plus four right angles, is equal to twice as many right angles as the polygon has sides, and consequently, equal to the sum of the interior angles plus the exterior angles.
Page 239 - O's, points or dots are introduced instead of the 0's through the rest of the line, to catch the eye, and to indicate that from thence the annexed first two figures of the Logarithm in the second column stand in the next lower line. N'.
Page 121 - ... or cylinder be cut by a plane parallel to the base, the section is a figure parallel and similar to the base. The one point a...
Page 9 - A circle (Fig. 38) is a figure bounded by a curved line, called the circumference, every point of which is equally distant from a point within, called the center.
Page 79 - A are verti' cal, produce the sides GE, CD till they meet in H. The two rectangles ABCD, AEHD, having the same altitude, AD, are to each other as their bases, AB, AE.