Elements of Geometry and Trigonometry |
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Page 18
... Let ABC be a triangle : then will the sum of two of its sides , as AC , CB , be greater than the third side AB . For the straight line AB is the short- est distance between the points A and B ( Def . 3. ) ; hence AC + CB is greater A ...
... Let ABC be a triangle : then will the sum of two of its sides , as AC , CB , be greater than the third side AB . For the straight line AB is the short- est distance between the points A and B ( Def . 3. ) ; hence AC + CB is greater A ...
Page 19
... ABC , or upon its base BC , or within it . First Case . The straight line GC < GI + IC , and the straight line AB ... Let the side ED = BA , the side EF BOOK 1 . 19.
... ABC , or upon its base BC , or within it . First Case . The straight line GC < GI + IC , and the straight line AB ... Let the side ED = BA , the side EF BOOK 1 . 19.
Page 21
... Let the angle ABC be equal to the angle ACB ; then will the side AC be equal to the side AB . D For , if these sides are not equal , suppose AB to be the greater . Then , take BD equal to AC , and draw CD . Now , in the two triangles ...
... Let the angle ABC be equal to the angle ACB ; then will the side AC be equal to the side AB . D For , if these sides are not equal , suppose AB to be the greater . Then , take BD equal to AC , and draw CD . Now , in the two triangles ...
Page 29
... Let ABC be any triangle : then will the an- gle C + A + B be equal to two right angles . B E A D For , produce the side CA towards D , and at the point A , draw AE parallel to BC . Then , since AE , CB , are parallel , and CAD cuts them ...
... Let ABC be any triangle : then will the an- gle C + A + B be equal to two right angles . B E A D For , produce the side CA towards D , and at the point A , draw AE parallel to BC . Then , since AE , CB , are parallel , and CAD cuts them ...
Page 30
... ABC , the exterior angle BAD is equal to the sum of the two interior opposite angles B and C. For , AE being ... Let ABCDEFG be the proposed polygon . If from the vertex of any one angle A , diagonals , AC , AD , AE , AF , be drawn to ...
... ABC , the exterior angle BAD is equal to the sum of the two interior opposite angles B and C. For , AE being ... Let ABCDEFG be the proposed polygon . If from the vertex of any one angle A , diagonals , AC , AD , AE , AF , be drawn to ...
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Common terms and phrases
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 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 number of sides opposite parallel parallelogram parallelopipedon pendicular perimeter perpen perpendicular plane MN polyedron polygon ABCDE PROBLEM Prop proportional PROPOSITION pyramid quadrant quadrilateral quantities radii radius ratio rectangle regular polygon right angled triangle S-ABCDE 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
Popular passages
Page 18 - If two triangles have two sides of the one equal to two sides of the...
Page 232 - ... the logarithm of a fraction is equal to the logarithm of the numerator minus the logarithm of the denominator.
Page 168 - The radius of a sphere is a straight line drawn from the centre to any point of the surface ; the diameter or axis is a line passing through this centre, and terminated on both sides by the surface.
Page 31 - Hence, the interior angles plus four right angles, is equal to twice as many right angles as the polygon...
Page 18 - America, but know that we are alive, that two and two make four, and that the sum of any two sides of a triangle is greater than the third side.
Page 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.
Page 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'.
Page 168 - 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 287 - How many square feet are there in the convex surface of the frustum of a square pyramid, whose slant height is 10 feet, each side of the lower base 3 feet 4 inches, and each side of the upper base 2 feet 2 inches ? Ans.
Page 64 - To inscribe a circle in a given triangle. Let ABC be the given triangle. Bisect the angles A and B by the lines AO and BO, meeting at the point 0.