Elements of Geometry and Trigonometry: With Practical ApplicationsR.S. Davis & Company, 1869 - 382 pages |
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Page 9
... common side , as A B. 15. A RIGHT ANGLE is one which is formed by a straight line and a perpendicular to it ; as the angle САВ . C 16. An ACUTE ANGLE is one which is less than a right angle ; as the angle DEF . E -B A D F E An OBTUSE ...
... common side , as A B. 15. A RIGHT ANGLE is one which is formed by a straight line and a perpendicular to it ; as the angle САВ . C 16. An ACUTE ANGLE is one which is less than a right angle ; as the angle DEF . E -B A D F E An OBTUSE ...
Page 15
... other straight lines at a common point , making adjacent angles , which to- gether are equal to two right angles , the two lines form one and the same straight line . Let the straight line DC meet the two straight lines BOOK I. 15.
... other straight lines at a common point , making adjacent angles , which to- gether are equal to two right angles , the two lines form one and the same straight line . Let the straight line DC meet the two straight lines BOOK I. 15.
Page 16
... common point C , making the adjacent angles ACD , DCB to- gether equal to two right angles ; then the lines AC and CB will form one and the same straight line . .D A B с E If C B is not the straight line AC produced , let CE be that ...
... common point C , making the adjacent angles ACD , DCB to- gether equal to two right angles ; then the lines AC and CB will form one and the same straight line . .D A B с E If C B is not the straight line AC produced , let CE be that ...
Page 17
... common , A and B , cannot separate from each other when produced ; hence they must form one and the same straight line . PROPOSITION IV . THEOREM . 49. When two straight lines intersect each other , the opposite or vertical angles which ...
... common , A and B , cannot separate from each other when produced ; hence they must form one and the same straight line . PROPOSITION IV . THEOREM . 49. When two straight lines intersect each other , the opposite or vertical angles which ...
Page 20
... common , and the angle B equal to the angle ACB by hypothesis ; therefore , since two sides and the included angle in the one are equal to two sides and the included angle in the other , each to each , the triangle DBC is equal to the ...
... common , and the angle B equal to the angle ACB by hypothesis ; therefore , since two sides and the included angle in the one are equal to two sides and the included angle in the other , each to each , the triangle DBC is equal to the ...
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Common terms and phrases
A B C ABCD adjacent angles altitude angle equal angles ACD base bisect centre chord circle circumference circumscribed cone convex surface cosec Cosine Cotang cylinder diagonal diameter distance divided drawn equal Prop equilateral triangle equivalent exterior angle feet formed frustum gles greater GREENLEAF'S half the sum hence homologous hypothenuse inches included angle inscribed isosceles less Let ABC line A B logarithmic sine measured by half multiplied number of sides parallel parallelogram parallelopipedon pendicular perimeter perpendicular plane MN polyedron prism PROBLEM PROPOSITION pyramid quadrantal radii radius ratio rectangle regular polygon right angles right-angled triangle rods Scholium secant segment side A B similar slant height solve the triangle sphere spherical polygon spherical triangle Tang tangent triangle ABC triangle equal trigonometric functions TRIGONOMETRY vertex
Popular passages
Page 37 - 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 103 - If two triangles have two angles of the one equal to two angles of the other, each to each, and also one side of the one equal to the corresponding side of the other, the triangles are congruent.
Page 95 - Each side of a spherical triangle is less than the sum of the other two sides.
Page 172 - If two planes are perpendicular to each other, a straight line drawn in one of them, perpendicular to their common section, will be perpendicular to the other plane.
Page 121 - Through a given point to draw a straight line parallel to a given straight line, Let A be the given point, and BC the given straight line : it is required to draw through the point A a straight line parallel to BC.
Page 272 - ALSO THE AREA OF THE TRIANGLE FORMED BY THE CHORD OF THE SEGMENT AND THE RADII OF THE SECTOR. THEN...
Page 33 - C' (89) (90) (91) (92) (93) 112. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.
Page 19 - In an isosceles triangle, the angles opposite the equal sides are equal.
Page 94 - In any quadrilateral the sum of the squares of the sides is equivalent to the sum of the squares of the diagonals, plus four times the square of the straight line that joins the middle points of the diagonals.
Page 102 - 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'.