何度もすみません。またエラーです。
お時間のあるときで結構ですので、どうぞよろしくお願いします。

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! Undefined control sequence.
\rubyfont ->\ifnum \jfsize 
                           =10\let \jhira =\fivedmjhira \fi \ifnum \jfsize =...
l.16 ...おいて点Qの軌跡を弧とする\ruby{扇}{おうぎ}
                                                  形の面積は
? x
 
Here is how much of TeX's memory you used:
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 46i,16n,34p,297b,865s stack positions out of 3000i,500n,5000p,200000b,5000s
Output written on cen2B.dvi (1 page, 3344 bytes).

▼関連発言
│
└◆6987:cen２Bがコンパイルできません [cenｔｅｒ] 01/22 09:04
　└◆6988:Re:cen２Bがコンパイルできません [石原　守] 01/22 09:12
　　└◆6989:Re[2]:cen２Bがコンパイルできません [osm] 01/22 11:24
　　　└◆6990:Re[3]:cen２Bがコンパイルできません [石原　守] 01/22 13:01
　　　　└◆6991:Re[4]:cen２Bがコンパイルできません [osm] 01/22 13:09
　　　　　├◆6992:--- [---] 01/22 13:17
　　　　　└◆6993:Re[5]:cen２Bがコンパイルできません [石原　守] 01/22 13:21
　　　　　　└◆6995:Re[6]:cen２Bがコンパイルできません [osm] 01/22 15:13
　　　　　　　└◆6996:Re[7]:cen２Bがコンパイルできません [石原　守] 01/22 15:58
　　　　　　　　├◆6997:Re[8]:cen２Bがコンパイルできません [cenｔｅｒ] 01/22 16:05
　　　　　　　　└◆6998:Re[8]:cen２Bがコンパイルできません [osm] 01/22 16:28
　　　　　　　　　└◆6999:Re[9]:cen２Bがコンパイルできません [石原　守] 01/22 16:30
　　　　　　　　　　└◆7000:Re[10]:cen２Bがコンパイルできません [osm] 01/22 17:46<-last