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altitude base called centre chord circle circumference column common cone consequently contain convex surface corresponding Cosine Cotang cubic cylinder decimal described diagonal diameter difference distance divided draw drawn entire equal equal to half equivalent EXAMPLES extremity feet figure follows formed four frustum given gives greater hence horizontal inches included angle inscribed intersect length less Let ABCD logarithm measured meet multiplied parallel parallelogram pass perimeter perpendicular plane polygon prism PROBLEM proportion proved pyramid quadrilateral quantities radius ratio Reader rectangle regular remaining right angles RULE scale School segment similar Sine slant height solidity sphere square straight line suppose surface taken Tang tangent THEOREM third triangle triangle ABC unit viii whole yards
Page 48 - After remarking that the mathematician positively knows that the sum of the three angles of a triangle is equal to two right angles...
Page 29 - 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 85 - 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 208 - To find the area of a trapezoid. RULE. Multiply the sum of the parallel sides by the perpendicular distance between them, and then divide the product by two : the quotient will be the area (Bk.
Page 32 - In the lower numbers the maps avoid unnecessary detail, while respectively progressive, and affording the pupil new matter for acquisition each time he approaches in the constantly enlarging circle the point of coincidence with previous lessons in the more elementary books.
Page 169 - In every plane triangle there are six parts : three sides and three angles. These parts are so related to each other, that when one side and any two other parts are given, the remaining ones can be obtained, either by geometrical construction or by trigonometrical computation.
Page 197 - 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 Cway 33° 45' ; required the height of the tower.
Page 79 - If a straight line be divided into any two parts, the square of the whole line is equal to the squares of the two parts, together with twice the rectangle contained by the parts.