自分の力では解決できなかったので,
力を借りるために書き込みをしました.

\Yogen コマンドを使って角度を求めたいのですか,
エラーが出てしまいます.
ソースと,
出力されるエラーは以下の通りです.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 1. 概要
% 点A, O, Bを定義し, この3点から辺の長さを求め, 余弦定理によって角AOBの
% 大きさを求めたい.
%
% 2. 図の簡単なイメージ
%
%     B.
% 
%
%  A.                      .O
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass[a4j,fleqn]{jarticle}

\usepackage{emathP}

\begin{document}
\noindent
\begin{zahyou*}[ul = 1mm](0, 60)(0, 60)
  % 壁 AOB の頂点を定義し, 実線で結ぶ
 \oresen{%
  A(10, 10)w;%
  O(52, 10)e;%
  B(12, 25)w;%
 }
 % 辺AO, OB, BAの長さを求める
 \Kyori\A\O\AO
 \Kyori\O\B\OB
 \Kyori\B\A\BA
 % 角AOBの大きさを求める
 \Yogen[a]\BA\AO\OB\AOB
\end{zahyou*}
\end{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 出力されるエラー：
% ! Arithmetic overflow.
% \calc@next@digit ... \multiply \calc@numerator 10 
%                                                   \calc@Acount \calc@numerat...
% l.37  \Yogen[a]\BA\AO\OB\AOB
%                            
% ?  
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

以上です.
宣しくお願いします.

▼関連発言
│
└◆4992:\Yogen で3辺の長さから角の余弦を求めたい [aka] 07/24 03:34
　├◆4993:Re:\Yogen で3辺の長さから角の余弦を求めたい [fujine] 07/24 06:03
　├◆4994:Re:\Yogen で3辺の長さから角の余弦を求めたい [tDB] 07/24 08:58
　└◆4995:解決 - \Yogen で3辺の長さから角の余弦を求めたい [aka] 07/24 17:09<-last