?\r1!LbcA?B?C<B#BC hBA *BBÒL\r2 !m *n EÂBP?\r15?[\,N A O C N B O D 0,NAOB=I50° , 3!ia?b EÂB0 , *!ic\nÔÂBP?Q.\r7 .Ö×ØÙ?\r1H!L_K2 %B#JG!K____ #!iK ______ ;\r2H!L _K3 %B#JG!K #!iK ;\r3H!L _K4 %B#JG!K_____ #!iK :\r4H!L _Kn %B#JG!K #!iK .\rÚ?YZX\r1?Ûrs!i`µ?#BA ?B?C ¶hQ!_`0 \rA ?AB=2cmÜ BC=2cm, AC=2cm B ?AB=lcmÜ BC=lcmÜ AC=2cm\rC^ AB=2cm, BC=lcmJ AC=2cm B?AB=3cm, BC=lcmÜ AC=lcm\r2?8 B30\n"#"à`"á*\ná¾â`?0 )\rA ?70° B?75° C ?80° D ?60°\r3?!1_KBA ?B , !1BC ?D , cdeB0!#f10 \rA?4 ! B?6 ã! C ?4 R6 ! D ?ä? !\r4?RN 1 N 2 N?#JN1+N2å æ \rA ?00 <ZI+Z2<90° B?0° <ZI+Z2<180°\rC ?Zl+Z2<90° D ?90° <Zl+Z2<180°\r5?r^|}vw`0