3.2 图形的旋转&小专题9 旋转构造等腰(边)及等腰直角三角形-【名校课堂】2020-2021学年八年级下册初二数学（北师大版）（全国）书稿

!" ! !" " %& !!! # ! w%/yz # # $% ! ©ª-�  "! &'( !"# ! ! ÜÖ)m9¹º !! �ZK|1*8g ! �-°�*- " # '( �Z,�ZíL !( ±°²*Ö× )( ñäñ³*Ö× *( þ�ää³*Ö× #! !" ! 5 " ! # ! % ! $ ! / ÉE+Ë�*Ë5F ! B # %/$ -Ý # "/# ´5 / oµt¶+Ù°�`� n* ! 2°�*PG6 !!!!!! ! . $ /" !!! . + /" $! !" ! # "#% -M?OPQ ! 5 $ - #% ?F*1 5 ! # "#$ Ñ�°��n~ # "%' *¤¥ ! ¿À $ " # # °�18-5 !!!!!! ' " $ # 5 # ! $ *zÅ5S�-5 !!!!!! ' " + # J { "# ! #$ ! $" * z Å J { S � - !!!!!!!! ' " . # " # *zÅP- !!!!!! ' " / # °�*PG6 !!!!!! ! !"# # ! ÜÖ)*+ %! !" ! # "#% ´5 " Wt¶ ° � +%- ¦ # "$' ! "# & /89 ! #%&189 ! " #"%& #+%- ! 2 "$ & !!! & !!! 89 ! $'& !!!! & !!! 89 ! " '"%& "!!! & !!! ! " $"%& !!! ! &! ! " ! # "#% 3 5 % 6 ° � 1 8 ! ° � � � n # '$%! #$ "#&#!/ ! #%&. ! "%&/ ! 2 $' *9 6 " # '(#(/ !(+ )(. *(/ . / /" !!! . , /" '! ! $%#2 " �� # !" ! Ò # /"# ´5 / Wt¶°� 0%- n # /%$ *¤¥ ! B " "/#&.%- ! 2 " "/$& " # '(./- !(.%- )(+/- *(+%- (! ! $%$% " 0S # !" ! E # "#% 1 ! " "%#&2%- ! Ò # "#% ´5 % µt¶°��n # $'% ! �5 # *z Å5 ' MN-E? "% F ! 5 " *zÅ56 $ ! I9 $' > "# @5 . ! 2����Hj��*- " # '("%&$' !(#%&'. )( " "'.& " $ *("# & $. !"# $ ! M.ÜÖ]Ý )! !" ! ERZ&P ¡¯1 ! # "#% *45ÉE�+ QÂËJ*Ë5F ! Ò # "#% ´5 * oWt¶+Ù °� 2%- ! �n # "&#&%& ! 25 * * ¡6 " # '( " % ! % # !( " % ! # # )( " :# ! # # *( " # ! # # "# )*( *! ! $%$% " �� # ��"Q´ûH5°�HjPGÉ% l\"QØ~ ! 01°�PG|D*- " # '( M?OPQ !( R��?Q )( �¥?Q *( 7·0Hg¸ !"! ! $%$% " 6678 # «f�&POPQ�ã ! H�â ./- P ! öH�â +%- P ! !" # ��,£ ! ÆÒâ +%- P*�ãij�× ! ¼Òâ ./- P*�ã´45 " µt¶°� ! � #% % $' ! !" $ �� ! 2°�P " #"$ *GL6 " # !! '(#/- !(+%- )(./- *(,%- %' !!! !" ! !" " !!! ! $%#2 " D/ # !" ! E # "#% 1 ! "#&$ ! #%& +!, ! " #&,%- ! Ò # "#% ´5 " µt¶°��n # "$' ! m5 # *zÅ5 $ MN-E #% ?Ft ! 2 %$ *96 " # '(#!, !(#!1 )($ *($!, . ## /" !!!! �æ" ' �� ( ! !" ! Ò 67 # "#% ´&P45 % µt¶ °� 2%- ! �n # "&#&%! A' ""& ! B " #&$0- ! 2 " # *GL- " # '(1.- !(0$- )(,+- *(/.- !#! ! $%$% " bc # !" ! E 67 # "#% 1 ! "#&$ ! " %& +%- ! Ò 67 # "#% ´5 " °��n 67 # "#&%& ! � 5 # *zÅ5 #& -E "% F ! E #&%& FC5 $ ! � #&$&$ ! ¿À5 $ n #% *pqM@ " # '($ " 槡+ + 3# # !( 槡