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\begin{enumerate}

\item ���̐}�ɂ�����$\angle\,x$�C$\angle\,y$�̑傫�������߂Ȃ����B(���͕ʎ�)

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\ajMaru{1} & $\angle\,x\,=$~~~\color{white}{$45^\circ$}~~~~~~ & \ajMaru{1} & $\angle\,y\,=$~~~\color{white}{$60^\circ$}~~~~~~ \\[-8pt]
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\ajMaru{2} & $\angle\,x\,=$~~~\color{white}{$85^\circ$}~~~~~~  & \ajMaru{3} & $\angle\,x\,=$~~~\color{white}{$15^\circ$}~~~~~~ \\[-8pt]
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\ajMaru{4} & $\angle\,x\,=$~~~\color{white}{$55^\circ$}~~~~~~  & \ajMaru{5} & $\angle\,x\,=$~~~\color{white}{$42^\circ$}~~~~~~ \\[-8pt]
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\item ���̐}�͒���$\ell$�ƒ���$m$��������Ă���}�ł��B�ȉ��̕��͂��̐}����Β��p�����������Ƃ�����������ł��B
\fbox{\mathstrut~~~~~~}\,�ɓ��Ă͂܂鎮�܂��͌��t�������Ȃ����B

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$\angle\,a+\angle\,b=$\fbox{~~~$(1)$~~~}���

\hspace{15mm}$\angle\,a=$\fbox{~~~$(2)$~~~}$\cdots\cdots$\ajMaru{1}

�܂�$\angle\,b+\angle\,c=$\fbox{~~~$(3)$~~~}���

\hspace{15mm}$\angle\,c=$\fbox{~~~$(4)$~~~}$\cdots\cdots$\ajMaru{2}

\ajMaru{1}\ajMaru{2}���$\angle\,a=\angle\,c$

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$(3)$ & \color{white}{$180^\circ$}  & $(4)$ & \color{white}{$180^\circ-\angle\,b$} \\[-8pt]
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\item ���s���̐����𗘗p���āC
$\angle a$�Ɠ����傫���̊p��_$\mathrm{P}$���p�̒��_�ƂȂ�悤�ɍ�}���Ȃ����B
��}�ɗp�������͏����Ȃ����ƁB�܂��ǂ��ɓ������p����}�����̂��킩��悤�ɂ��Ȃ����B
�܂��C�ǂ����Ă��̂悤�ȍ�}������Ƒ傫�����������Ȃ�̂��C�����ō�����}��p���Đ������Ȃ����B

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{\color{white}{���l��~$\angle\,a'=\angle\,a''\cdots$\ajMaru{2}}}\\
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{\color[named]{Black}{%
\special{pn 13}%
\special{pa 3980 2900}%
\special{pa 6380 2900}%
\special{fp}%
}}%
% LINE 1 0 3 0 Black White
% 2 3980 3500 6380 3500
% 
{\color[named]{Black}{%
\special{pn 13}%
\special{pa 3980 3500}%
\special{pa 6380 3500}%
\special{fp}%
}}%
% STR 2 0 3 0 Black White
% 4 3740 2250 3740 2350 2 0 0 0
% $\ell$
\put(37.4000,-23.5000){\makebox(0,0)[lb]{$\ell$}}%
% STR 2 0 3 0 Black White
% 4 3740 2850 3740 2950 2 0 0 0
% $m$
\put(37.4000,-29.5000){\makebox(0,0)[lb]{$m$}}%
% STR 2 0 3 0 Black White
% 4 3740 3450 3740 3550 2 0 0 0
% $n$
\put(37.4000,-35.5000){\makebox(0,0)[lb]{$n$}}%
% LINE 1 0 3 0 Black White
% 2 4580 2100 5780 3900
% 
{\color[named]{Black}{%
\special{pn 13}%
\special{pa 4580 2100}%
\special{pa 5780 3900}%
\special{fp}%
}}%
% LINE 1 0 3 0 Black White
% 2 5380 2100 4780 3900
% 
{\color[named]{Black}{%
\special{pn 13}%
\special{pa 5380 2100}%
\special{pa 4780 3900}%
\special{fp}%
}}%
% CIRCLE 1 0 3 0 Black White
% 4 4910 3500 4910 3700 4310 3500 4790 3900
% 
{\color[named]{Black}{%
\special{pn 13}%
\special{ar 4910 3500 200 200  1.8622531  3.1415927}%
}}%
% CIRCLE 1 0 3 0 Black White
% 4 5110 2900 5110 3100 4920 3500 5520 3500
% 
{\color[named]{Black}{%
\special{pn 13}%
\special{ar 5110 2900 200 200  0.9713438  1.8774726}%
}}%
% CIRCLE 1 0 3 0 Black White
% 4 4710 2300 4710 2500 5780 3900 5780 2300
% 
{\color[named]{Black}{%
\special{pn 13}%
\special{ar 4710 2300 200 200  6.2831853  0.9813528}%
}}%
% STR 2 0 3 0 Black White
% 4 5100 3140 5100 3240 2 0 0 0
% $x$
\put(51.0000,-32.4000){\makebox(0,0)[lb]{$x$}}%
% STR 2 0 3 0 Black White
% 4 4920 2380 4920 2480 2 0 0 0
% $55^\circ$
\put(49.2000,-24.8000){\makebox(0,0)[lb]{$55^\circ$}}%
% STR 2 0 3 0 Black White
% 4 4490 3610 4490 3710 2 0 0 0
% $70^\circ$
\put(44.9000,-37.1000){\makebox(0,0)[lb]{$70^\circ$}}%
% STR 2 0 3 0 Black White
% 4 780 4000 780 4100 2 0 0 0
% \ajMaru{5}
\put(7.8000,-41.0000){\makebox(0,0)[lb]{\ajMaru{5}}}%
% LINE 1 0 3 0 Black White
% 8 1200 4400 3200 6000 3200 6000 1200 5800 1200 5800 3200 4200 3200 4200 1200 4400
% 
{\color[named]{Black}{%
\special{pn 13}%
\special{pa 1200 4400}%
\special{pa 3200 6000}%
\special{fp}%
\special{pa 3200 6000}%
\special{pa 1200 5800}%
\special{fp}%
\special{pa 1200 5800}%
\special{pa 3200 4200}%
\special{fp}%
\special{pa 3200 4200}%
\special{pa 1200 4400}%
\special{fp}%
}}%
% CIRCLE 1 0 3 0 Black White
% 4 1200 4400 1200 4660 3200 6000 3200 4200
% 
{\color[named]{Black}{%
\special{pn 13}%
\special{ar 1200 4400 260 260  6.1835167  0.6747409}%
}}%
% CIRCLE 1 0 3 0 Black White
% 4 3200 4200 2860 4200 1200 4400 1200 5800
% 
{\color[named]{Black}{%
\special{pn 13}%
\special{ar 3200 4200 340 340  2.4668517  3.0419240}%
}}%
% CIRCLE 1 0 3 0 Black White
% 4 3200 6000 2900 6000 1200 4400 1200 5800
% 
{\color[named]{Black}{%
\special{pn 13}%
\special{ar 3200 6000 300 300  3.2412613  3.8163336}%
}}%
% CIRCLE 1 0 3 0 Black White
% 4 1200 5800 1450 5830 3200 6000 3200 4200
% 
{\color[named]{Black}{%
\special{pn 13}%
\special{ar 1200 5800 252 252  5.6084444  0.0996687}%
}}%
% STR 2 0 3 0 Black White
% 4 1490 4450 1490 4550 2 0 0 0
% $x$
\put(14.9000,-45.5000){\makebox(0,0)[lb]{$x$}}%
% STR 2 0 3 0 Black White
% 4 2640 4330 2640 4430 2 0 0 0
% $28^\circ$
\put(26.4000,-44.3000){\makebox(0,0)[lb]{$28^\circ$}}%
% STR 2 0 3 0 Black White
% 4 1470 5660 1470 5760 2 0 0 0
% $45^\circ$
\put(14.7000,-57.6000){\makebox(0,0)[lb]{$45^\circ$}}%
% STR 2 0 3 0 Black White
% 4 2680 5790 2680 5890 2 0 0 0
% $25^\circ$
\put(26.8000,-58.9000){\makebox(0,0)[lb]{$25^\circ$}}%
\end{picture}%
]

\end{enumerate}



\end{document}

