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88ᫀ{7᪆1.ூ8ᫀBூ7᪆7Y4ஹe¬n/Qyᐰöᔠᦑ;⌱⚗┯ü®8ஹe¬nQýyᐰöᔠᦑ;⌱⚗çþ®Cஹe¬n/Qyᐰöᔠᦑ;⌱⚗┯ü®ஹe¬n/Qyᐰöᔠᦑ;⌱⚗┯ü®ᦑ⌱YB.ᑭᵨᐰ+nḄᭆ ᫀ.⚪ὃḄᐰḄஹᐰḄឋ᧕ḄẠ⚪.2.ூᫀCAC=ADூ᪆"•••ᙠAABC%&'/)*+4=+4,.AE=AB•••ABC-&AED(SAS),•••zl=Z.AED,■■■/.AED+Z2=90°,41+42=90°,ᦑ⌱"C.✌ᐜ23AABC-AED,᪷5ᐰ-6Ḅឋ41=N4ED,7᪷586Ḅ9:+4ED+N2=907᪷5<=ᣚ41?42Ḅ%@90.A⚪B⌕ὃDᐰᐵFGHᐰ-6Ḅᑨ9%ឋ.3.ூᫀBூ᪆ூᑖ᪆⚪ὃDᐰ-6Ḅឋ⚪ḄᐵFKᑮMᐰ-6ḄNO6.ᵫAABC-ADE,4BAC=4ZME,ᑣ=NCAE,7ᵫNBAC=NBAE—NCZE,ᓽSᫀ.
9ூ",ABC ADE,Z.BAC=Z.DAE,•••/.BAD=Z.CAE,vZ.BAE=120°,4BAD=40°,4BAC=Z.BAE-/.CAE=120°-40°=80°.ᦑ⌱"B.4.ூᫀBூ᪆ூᑖ᪆T6-6ᐰḄᑨ9UV"HL,SAS,ASA,SSS,44S,W⚪X⌕Yᔠ[\ᩩ^?ᐰḄᑨ9UV⌲`a2.ூ"4ஹbᔠᑨ9HZ,,ᦑ⌱⚗defbᔠ⚪ghBஹᐰ-6Ḅᑨ9ijᨵlḄm?ᦑ⌱⚗┯obᔠ⚪ghCஹbᔠᑨ944S,ᦑ⌱⚗defbᔠ⚪ghDஹbᔠᑨ9S4S,ᦑ⌱⚗defbᔠ⚪g.ᦑ⌱B5.ூᫀDூ᪆ூᑖ᪆⚪ὃDᐰ-6Ḅᑨ9%ឋ᪷5[\ᩩ^23SA4CE-ABDE⚪ḄᐵF.᪷5ᐰ-6Ḅᑨ9S&4-&BOCQ4s4),ᑣD=Cpq2S&4CE-&BDE,rsOE,23A40E-ABOE,ᑣStEᙠN40BḄuᑖvw.ூ"•••OA=OB,N4=NB,N40D=NB0C,■■.^AOD^^BOC(ASA),ᦑজdehOD=CO,BD=AC,
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11ூ᪆"l4BCDul:.ABI/CD, ••Z.ACD=Z-BAC,ᵫᢚḄឋ"BAC=KB'AC,^BAC=Z.ACD=^B'AC=-zl=22°,2 B=180°-Z2-4BAC=180°-44°-22°=114°hᦑ⌱"C.ᵫulḄឋ%ᢚḄឋS+4co=BAC=48%ᵫ-6Ḅ6ឋ¬S^BAC=Z.ACD=B'AC=|zl=22°,7ᵫ-6ᑁ6%9ᳮ¬SNBᓽ.⚪ὃDulḄឋஹᢚḄឋஹ-6Ḅ6ឋ°-6ᑁ6%9ᳮh~±HulḄឋ¬S+B4CḄ²ᦪ⚪ḄᐵF.9.ூᫀDூ᪆ூᑖ᪆Tsᑭᵨ-6ᐰḄᑨ9ᩩ^µᑨ9ᓽ¬ᫀh¶gqSS4f¸ᑨ9-6ᐰḄ.A⚪ὃDᐰ-6Ḅᑨ9.¶g¹ºM»-6ᐰᐳᨵ»9ᳮᓽ4ASஹ4S4ஹS4SஹSSS,T6-6ᵨHL9ᳮÀ444ஹSS4ÁV23-6ᐰ.ூ"4ÂÃBC=EC,NB=tEᵨS4Sᑨ9M»-6ᐰᦑA⌱⚗deh8.ÂÃBC=EC,AC=DCᵨSSSᑨ9M»-6ᐰᦑ8⌱⚗dehC.ÂÃ=44=4ᵨ4s4ᑨ9M»-6ᐰᦑC⌱⚗deh.ÂÃ8C=EC,44=4Ç554ÁV23-6ᐰᦑ⌱⚗┯o.ᦑ⌱"D.10.ூᫀCூ᪆"•••4D1BC,•••Z.ADB=/.ADC=90°,ᵫ=4C,AD=AD,•••&ABD-&2CD(HL),
12•••BD——CD.ᦑ⌱"C.᪷5“M᪷˲@12ÌḄÍÎ`ÏÐᙠÑᩚwÓ`ÏᑖÔ9ᙠᙢ☢M»ᩈw”ᑨAB=AC,y.AD=AD,AD1BC,ᡠ&48-&ACᡠBD=CD.⚪ὃDᐰ-6Ḅᑨ9°ឋḄOᵨhᐙᑖÜᵨ⚪Ýᩩ^ᩩ^ÞK-6ᐰḄᩩ^.⚪ᐵF23&ABD-&ACD.11.ூᫀDூ᪆ூᑖ᪆⚪ßtὃD-6ᐰḄᑨ9°ឋ¹ºM»-6ᐰᐳᨵ»9ᳮᓽ44STS4SASஹSSS,°ᐰ-6ឋḄÜᵨ.ᐜÜᵨS4S23&ABO-&4CD,7᪷5ᐰ-6Ḅឋᫀ.ூ"••àADLBC,@BC*t4ADB=/.ADC=90°,BD=CD,ᙠ&ABD%&ACD*AD=ADZ.ADB=Z.ADC,BD=CD.•.&4B0-&4CD(SAS),ᦑ(1)deh•••AB-AC,B——ZC,BAD-Z.CAD,•••44ABCḄ`ᩩ6uᑖv.••প(2)ব(4)de.ᦑ⌱"D.12.ூᫀCூ᪆"DELAC,•••/.CDE=90°,ZC+ACDE=90°,4CDE+/.ADE=90°,:,Z.ADE=Z.C>•••DE//AB,
13:.Z.ADE=BAD,:.Z-C=Z-BADfvFD1AB.:.DF//AC,:.Z-BDF=zC.ᦑ⌱c.ᑭᵨᚖTᑮ"DE=^AFD=90ᯠÇᑭᵨ6Ḅ86åKS?zcgc◀)åḄ6.⚪ὃD86%⊡6"éM»6Ḅ%90(T6)êëìM»6í@86.ᓽᐸ*`»6Ó`»6Ḅ86.éM»6Ḅ%180(u6)êëìM»6í@⊡6.ᓽᐸ*`»6Ó`»6Ḅ⊡6.13.ூᫀBூ᪆ïᑖ᪆ð✌ᐜ23+4=/.DEC,ᯠÇᑭᵨA4Sᑨ9&ABE-4ECD,µqEC=AB=5m,7¬SBEḄËᯠÇᑭᵨñò◀ó²Xô.A⚪B⌕ὃDᐰ-6ḄOᵨᐵFdeᑨ9&48E-AECD.ïõð"•••Z.AED=90°,•••^AEB+DEC=90°,•••ABE=90°,•••+4+Z.AEB=90°,:.Z-A=DEC,(Z.B=Z.Cᙠ^ABE^\^DCE*=DEC,AE=DE.••ABE-&ECD(44S),. .EC=AB=5m,vBC=13m,BE=8m, ,•÷øùḄXô8+1=8(s),
14ᦑ⌱8.14.ூᫀAூ᪆"úDPIBCXDPḄûᨬ÷•••BDuᑖN4BC,"=90°DP1BCXDP=AD,•%AD=3,• •DPḄᨬ÷û3,ᦑ⌱"A.ᵫᚖvýᨬþ\úXDPᨬþ᪷56uᑖvḄឋᓽSYÿ.⚪ὃḄᑖḄឋḄᑖḄᑮḄḄ⚪Ḅᐵ .15.ூᫀCூ᪆#$&D14B'D,OE1BC'E,(14C'F,*,•••-48CḄ.ᩩᑖḄ0•••OD=OE—OF,•••Si=^-AB-OD,S2+S3BC-OE+^-AC-OF=^OD■(BC+AC),14B6ᑮSi=@4B-0D,S+S=IOD-(BC+AQ,ᯠB᪷5.:.Ḅ23ᐵC6ᑮSi.16.ூᫀC
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