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一つ前の記事で、次に検討すると記述した長さについての関係性をまとめておく。
図において、OGは、足などの実体であり長さは
である。この長さが正面図において見えているのが、OLである。また、側面図において見えているのがOHとなる、それらの長さは
と
である。正面図、側面図では、角度θとφが捉えられているとしよう。
このときまず、の位置は同じだから、
が成立する。
さらに、
が成立する。これら二つの式より、
がと角度の値から求めることができる。