Elements of Geometry: With Practical Applications ... |
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Page 10
... diagonal , the quadri- lateral has two diagonals , the pentagon has five , and so on for polygons of a greater number of sides . The number of diagonals of a polygon of n sides is given by this algebraic expression , n ( n − 3 ) ...
... diagonal , the quadri- lateral has two diagonals , the pentagon has five , and so on for polygons of a greater number of sides . The number of diagonals of a polygon of n sides is given by this algebraic expression , n ( n − 3 ) ...
Page 41
... diagonal divides it into two equal triangles . Let ABCD be a parallelogram , of which the diagonal is AC ; then will its opposite sides and angles be equal to each other , and the A diagonal will divide it into two equal triangles . D B ...
... diagonal divides it into two equal triangles . Let ABCD be a parallelogram , of which the diagonal is AC ; then will its opposite sides and angles be equal to each other , and the A diagonal will divide it into two equal triangles . D B ...
Page 42
... diagonal AC be drawn ; then the triangles ABC , CDA , being mutually equilateral , are also mutually equiangular ( Prop . vIII ) , or have their corresponding angles equal ; consequently the opposite sides are parallel ( Prop . xvii ) ...
... diagonal AC be drawn ; then the triangles ABC , CDA , being mutually equilateral , are also mutually equiangular ( Prop . vIII ) , or have their corresponding angles equal ; consequently the opposite sides are parallel ( Prop . xvii ) ...
Page 43
... diagonal AC ; then , because AB and DC are parallel , the angle BAC is equal to its alternate angle DCA ( Prop . XVII ) ; hence the two triangles , having two sides and the included angle of the one equal to two sides and the included ...
... diagonal AC ; then , because AB and DC are parallel , the angle BAC is equal to its alternate angle DCA ( Prop . XVII ) ; hence the two triangles , having two sides and the included angle of the one equal to two sides and the included ...
Page 47
... diagonal CF , cutting off the triangle CDF ; through the point D , draw DG parallel to CF , and meeting AF produced ; draw CG , and the polygon ABCDF will be equivalent to ABCG , which has one side less than the original polygon . D B H ...
... diagonal CF , cutting off the triangle CDF ; through the point D , draw DG parallel to CF , and meeting AF produced ; draw CG , and the polygon ABCDF will be equivalent to ABCG , which has one side less than the original polygon . D B H ...
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Common terms and phrases
a+b+c AC² altitude angle ACD angle BAC bisect centre chord circ circular sector circumference cone consequently convex surface cylinder diagonal diameter distance draw equal and parallel equiangular equilateral triangle equivalent exterior angle figure formed four right angles given line greater half the arc hypothenuse inscribed circle intersection isosceles join less Let ABC lines drawn magnitude measured by half meet multiplied number of sides opposite angles parallel planes parallelogram parallelopipedon pendicular perimeter perpendicular plane MN point G prism PROBLEM produced Prop PROPOSITION pyramid radii radius rectangle regular polygon respectively equal right angles right-angled triangle Sabc Schol Scholium semicircle semicircumference side AC similar similar triangles solid angle solid described sphere spherical triangle square straight line suppose tangent THEOREM three sides triangle ABC triangular prism vertex VIII
Popular passages
Page 37 - The sum of all the angles of a polygon is equal to twice as many right angles as the polygon has sides, less two.
Page 180 - THEOREM. If one of two parallel lines is perpendicular to a plane, the other will also be perpendicular to this plane. Let AP & ED be parallel lines, of which AP is perpendicular to the plane MN ; then will ED be also perpendicular to this plane.
Page 139 - PROBLEM. To inscribe a circle in a given triangle. Let ABC be the given triangle : it is required to inscribe a circle in the triangle ABC.
Page 224 - The radius of a sphere is a straight line, drawn from the centre to any point of the...
Page 43 - In a right-angled triangle, the side opposite the right angle is" called the Hypothenuse ; and the other two sides are cal4ed the Legs, and sometimes the Base and Perpendicular.
Page 184 - THEOREM. If two angles, not situated in the same plane, have their sides parallel and lying in the same direction, they will be equal, and the planes in which they are situated will be parallel.
Page 10 - A circle is a plane figure contained by one line, which is called the circumference, and is such, that all straight lines drawn from a certain point within the figure to the circumference are equal to one another.
Page 226 - We conclude then, that the solidity of a cylinder is equal to the product of its base by its altitude.
Page 22 - If two sides and the included angle of the one are respectively equal to two sides and the included angle of the other...
Page 12 - If equals be added to unequals, the wholes are unequal. V. If equals be taken from unequals, the remainders are unequal. VI. Things which are double of the same, are equal to one another.