Shaw's Civil architecture; being a complete theoretical and practical system of building, containing the fundamental principles of the art . I I K I, n leF^Ovtti-v Sc. PRACTICAL GEOMETRY. 43 equal to three given lines, D, E, F, if anytwo are greater tlian the third. 1. Draw A B equal to the line D. 2. Upon B, with the length of E, describe an arcat C. 2. Upon B, with the length F, describe another arc,intersecting the former at C. 4. Draw A C and C B, and A B C will be the tri-angle required. Plate 4. PROBLEM XXVIII. To make a trapezium equal and similar to agiven trapezium, A B C D. 1. Divide
Shaw's Civil architecture; being a complete theoretical and practical system of building, containing the fundamental principles of the art . I I K I, n leF^Ovtti-v Sc. PRACTICAL GEOMETRY. 43 equal to three given lines, D, E, F, if anytwo are greater tlian the third. 1. Draw A B equal to the line D. 2. Upon B, with the length of E, describe an arcat C. 2. Upon B, with the length F, describe another arc,intersecting the former at C. 4. Draw A C and C B, and A B C will be the tri-angle required. Plate 4. PROBLEM XXVIII. To make a trapezium equal and similar to agiven trapezium, A B C D. 1. Divide the given trapezium A B C D into twotriangles, by a diagonal, A C. 2. ]Make E F equal to A B upon E F, constructthe triangle E F, whose three sides will be respec-tively equal to the triangle ABC. 3. Upon E G, which is equal to A C, constructthe triangle E G H, whose two sides, E H and G H,are respectively equal to A D and C D, then E FG H wUl be the trapezium required. Li the same manner may any irregular polygon bemade equal and similar to a given irregular polygon,by dividing the given polygon into triangles, and con-structing the
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