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    \underline{\hspace{1cm}}�N\underline{\hspace{1cm}}�g\underline{\hspace{1cm}}��
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\begin{enumerate}

\item ���̂��Ƃ�����O�p�`�̍������g���ďؖ�����Ƃ��C�g�p����O�p�`�̍�
�������𓚂��Ȃ����B

\begin{enumerate}

\item $\mathrm{AB}=\mathrm{AC}$�̓񓙕ӎO�p�`�ɂ����Ē�p�����������Ƃ�$\angle \mathrm{A}$�̓񓙕���
�������ďؖ������B

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\item (1)�ɂ����Ē��$\mathrm{BC}$�̒��_�ƒ��_$\mathrm{A}$�����Ԑ����������ďؖ������B

\item $2$�p�C$\angle \mathrm{B}$��$\angle \mathrm{C}$���������O�p�`�͓񓙕ӎO�p�`�ł��邱�Ƃ�$ 
\angle \mathrm{A}$�̓񓙕����������ďؖ������B

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\item (3)�ɂ����ē_$\mathrm{A}$������$\mathrm{BC}$�ɐ����������ďؖ������B

\item ���p�O�p�`�ɂ́u�Εӂ�$1$�s�p�v�Ƃ����������������邱�Ƃ��ؖ������B

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\hspace{-8mm}
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\item �����`$\mathrm{ABCD}$�̓y�n���܂��$\mathrm{PQR}$��$2$�ɕ������Ă���B
����$2$�̓y�n�̖ʐς�ς��Ȃ��Ő܂���𒼐��ɂ���ɂ́C
�ǂ̂悤�Ȓ����������΂悢�ł����B���̐�����}���Ȃ����B

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\item ���̐}��$\mathrm{AB}=\mathrm{CB},\mathrm{AD}=\mathrm{CD}$�Ȃ�ΐ���$\mathrm{BD}$��
$\angle \mathrm{ABC}$�̓񓙕����ł��邱�Ƃ��ؖ����Ȃ����B
�i����C���_���L�����Ȃ����j

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����j

\vspace{10mm}

���_�j

\vspace{10mm}

�ؖ��j

\vspace{50mm}

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\item ���̐}�͎O�p�`�̓��p�̘a��$180^{\circ }$�ł��邱�Ƃ��ؖ����悤�Ƃ��āC
$ \triangle \mathrm{ABC}$�̓_$\mathrm{C}$��ʂ��$\mathrm{AB}$�ɕ��s�Ȓ���$\mathrm{DC}$�������C
��$\mathrm{BC}$����������$\mathrm{CE}$�Ƃ����}�ł���B

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�����Ȃ����B

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�ؖ��j$\mathrm{AB}/\hspace{-1mm}/\mathrm{DC}$���C\fbox{~~�A~~}~������������

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$\angle \mathrm{B}$ & $=$ & \fbox{~~�C~~}
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�܂��C\fbox{~~�E~~}~������������

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���������āC

$\angle \mathrm{A}+\angle \mathrm{B} +\angle \mathrm{ACD}$

$=\fbox{~~�G~~} +\fbox{~~�C~~} +\angle \mathrm{ACB}$

$=180^{\circ }$

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\vspace{3mm}
\item $\mathrm{AD}/\hspace{-1mm}/\mathrm{BC}$�ł����`$\mathrm{ABCD}$��$2$�̑Ίp���̌�_��$\mathrm{O}$�Ƃ���Ƃ��C
$\triangle \mathrm{OAB}=\triangle \mathrm{ODC}$�ł��邱�Ƃ�������Ȃ����B

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 \\
 \\
\\
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 \\
 \\
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\item ���̐}�́C�񓙕ӎO�p�`$\mathrm{ABC}$�̒��$\mathrm{BC}$��ɓ_$\mathrm{D}$���Ƃ�C$\mathrm{CD}=\mathrm{BE},\mathrm{BD}=\mathrm{CF}$��
�Ȃ�悤�ɕ�$\mathrm{AB},\mathrm{AC}$��ɓ_$\mathrm{E},\mathrm{F}$���Ƃ������̂ł���B���̂Ƃ��ȉ��̖₢�ɓ�
���Ȃ����B

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\end{picture}
}

\vspace{3mm}
\begin{enumerate}

\item $ \triangle \mathrm{DEF}$�͓񓙕ӎO�p�`�ł��邱�Ƃ��ؖ����Ȃ����B(����C���_�͏����Ȃ��Ă悢�B)

\vspace{80mm}

\item $ \angle \mathrm{A}=a^{\circ }$�̂Ƃ��C$\angle \mathrm{DEF}$�̑傫����$a$��p���ĕ\���Ȃ����B

\vspace{40mm}
\begin{flushright}
\begin{tabular}{|c|}
\hline
  \\[-8pt]
 \hspace{55mm}$^{\circ }$ \\[-8pt]
 \\
\hline
\end{tabular}
\end{flushright}

\end{enumerate}

\end{enumerate}

\end{document}
