| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to work out an ORIZURU (finger works of using paper to make models of familiar things, in this case a crane) from a sheet of triangular paper which usually is square. SOLUTION: Drawing folding lines on a triangular paper ABC solves matters. An angleαis a half of∠BAC. An angleβis half of a∠ABC. An angleχis a half of∠BCA. Now, a crossing point of bisectors of∠BAC and∠ABC is named I. Angleδis a quarter of∠BIC. An angleεis a half of∠CIA. An angleϕis a half of∠AIB. Now, a crossing point of a bisector of∠BIC and a line BC is named D. An angleηis a half of∠CDI. An angleα2 is a half ofα. An angleβ2 is a half ofβ. An angleχ2 is a half ofχ.
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