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18PᙠNACBḄᑖ¡!ᓽAABCḄDᑖADஹBEஹC£,pP.ᡠ¤CDEḄCᩩDᑖ¦,p.ூ᪆᪷RᎷ⚪K¨'¤ᑨ©ª⚪⚪!ᳮᵫPjPW_L48!PQLBCQ,/?!4±᪷RDᑖḄឋNo/=PR,PW=PQ,oPR=PQ,³o(ᫀᓽ'.1⚪ὃ45CDEḄDᑖ!´8µDᑖḄឋNḄᑁ·;¸⚪Ḅᐵ=.21.ூ(ᫀANPN¹ᚖᑖḄᑨK¹ᚖᑖḄឋNூ᪆(1)kEkᡠ»Jk(2)?@:AM=AN,MP=PN,//• p4ஹPᙳᙠ¹MNḄᚖᑖ¡.(¹ᚖᑖ/ḄᑨK)!À;¹MNḄᚖᑖ!(¹ᚖᑖḄឋ1N)(ÁÂᳮḄÃR)!401BCD,ᓽ¹4AABCḄBBC¡ḄÅ!ᦑ(ᫀAN,PN,¹ᚖᑖḄᑨK)¹ᚖᑖḄឋN.(1)ᑭᵨÇÈÉÊËofqḄÇÈkE)(2)ᑭᵨjᑮBA=BE,ᑣ᪷R¹ḄᚖᑖḄឋNKᳮḄ⌮KᳮᑮpBஹpCÎᙠ¹4EḄᚖᑖ¡!ÏÐᑮBCᚖᑖ4E.1⚪ὃ45jk-Ñ1jk!¹ᚖᑖḄឋN!7ᙢjokE;⚪Ḅᐵ=.22.ூ(ᫀ(1)•••4ABC=Z.ACB,•••AB=AC,ÒÓ;AABCḄDᑖ!AD1BC, .^ADC=90°)(2)k!4C8F1GN4DE¦.ᳮᵫ/BD
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