Inventional Geometry: A Series of Problems, Intended to Familiarize the Pupil with Geometrical Conceptions, and to Exercise His Inventive Faculty

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D. Appleton and Company, 1881 - Geometry - 97 pages
 

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Page 43 - TRIANGLES upon the same base, and between the same parallels, are equal to one another.
Page 42 - A body which has four plane, equal, and similar surfaces, is called a tetrahedron. 131. Make a hollow tetrahedron of one piece of cardboard, and show on paper how you arrange the surfaces to fit each other, and give a sketch of the tetrahedron when made. You know how to fit a square in a circle. 132. Can you fit a square around a circle ? When two triangles have the angles of one respectively equal to the angles of the other, but the sides of the one longer or shorter respectively than the sides...

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