Hoffmann, Professor, 1839-1919 · London : Frederick Warne · leaf 155
Fig. 312. … \ ^ / Cs S\h <xA \ ° /b e Fig. 313. Fig. 314. The three smaller squares are formed as sliown in Fig. 312.The larger square either as Fig. 313 or Fig. 314. No. XXIV.—The Twenty Triangles. Solution. Place ten of the triangles alternately, so as to form a
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