Trêng THCS S¬n TiÕn GV: Ph¹m TuÊn Anh D¹y líp: 8B; 8E. Ngµy so¹n: 10/01/2010. TiÕt PPCT: 35. Ngµy d¹y: 19/01/2010.     !"#$"%&'( )$*!+!,*!  -+.)/!"*+*!*!#$0 %&'()$1+,/2#*3  #4&4*45/ 6+7  8#)9+12*&:;*&:%$  -9</2# #!%=*&:;*&: %$ >-?-@-ABC DE3F"+,GHI2JK Câu hi %75L),). !M,3+,NN Đp n O !+PQ""%&'(HR%E3K ST U  0 H U * 0 5,%V,0%&'(K >,NNHW%E3K D Q B F E A -!X/YZ[/%&'(Y5,3\ "$ ∆ ]Y>T ∆ ]>T ∆ ]OT ∆ ]YOT ∆ Z>YT ∆ [>HK ⇒S Y>O TS YZ[ TRS ]Y> ⇒S Y>O TS YZ[ TY>]T U 0 Y>O >,3: Gi¸o ¸n h×nh häc líp 8 Trêng THCS S¬n TiÕn GV: Ph¹m TuÊn Anh M -S M M M -S M -S M -S 8^ M -S M X"+,N_M `%aM `a+,+.!M4b!3!M 3!3 %&c  YZ>[" 21!3%&c4.,F&:M 1%&c> >M >TI0I90NTNW S Y>ZO M S Y>ZO T  NW 0 NU0N  0 OZY> + = + BC Tde03 0 `&"F">9 "3V !"+."%#4$%V,_3 ),e3*3V\+,W3),\ ):%#45:$$%Nf f  )g!*8*DM %E    %&c       !  " Y>O*F&:J"21!3 %&c4.,),!3+P# ,M 21%&c%&'">- >,N_HS8DhU0dK HUf2JK j 1 60 0 6cm D I C B A i( ∆ YOj$OTWf f ⇒ ∆ YO%a⇒YOTYTW3 ⇒Y-T KHNN 0 NW 0 N cm a == S Y>O TOY-TWN N TUI N H3 0 K >,0WHS8DhU0_KHd2JK 8Y>ZOHY>OZK Y>T0N3kOZTS "+ TI0I3 0 DS Y>ZO TM 81 l"$S Y>O TI0I), Y>T0N ⇒Y>>TI0I ⇒>TI0I90NTNW ^/4 S Y>ZO T NW 0 NU0N  0 OZY> + = + BC Tde03 0  >,/2HU02JK H D C B A 6cm 7cm 5cm 8-!"Y>O*Y>T_3* OTe3k>TW3kTNf f DS Y>O TM 3 "3#)>-$-Tdf f * Gi¸o ¸n h×nh häc líp 8 Trêng THCS S¬n TiÕn GV: Ph¹m TuÊn Anh -S M -S 8^ M -S "3#)>-$-Tdf f *   T  Nf f  ⇒ BC 6 BH= = =3 2 2  H3K Hl%75K ^/4S Y>O TM ( ) ( ) 1 S = AB+CD .BH ABCD 2 1 2 = 5+7 .3 =18(cm ) 2 %&"F">Fm 39 #j"%J"4"M U -!5,%"#%a 0 !),!)$ n)! " !op N -""3#$ +P "!""3#%$+P " R F  #  !  X  /  $ n)!!)$  5:q F#jFj,%J*j ,"M TNf f  ⇒ BC 6 BH= = =3 2 2 H3KHl %75K ( ) ( ) 1 S = AB+CD .BH ABCD 2 1 2 = 5+7 .3 =18(cm ) 2 >,/2H_2JK US 0` NS R` -&:r)a,H U2JK  il35\#+,/2%=X"  ,3+,/2NRhsNWHS8DhU0IK  `F&:+, %"# Gi¸o ¸n h×nh häc líp 8 . Trêng THCS S¬n TiÕn GV: Ph¹m TuÊn Anh D¹y líp: 8B; 8E. Ngµy so¹n: 10/01/2010. TiÕt PPCT: 35. Ngµy d¹y: 19/01/2010.    . F E A -!X/YZ[/%&'(Y5,3 "$ ∆ ]Y>T ∆ ]>T ∆ ]OT ∆ ]YOT ∆ Z>YT ∆ [>HK ⇒S Y>O TS YZ[ TRS ]Y> ⇒S Y>O TS YZ[ TY>]T U 0 Y>O >,3: Gi¸o ¸n h×nh häc líp 8 Trêng THCS S¬n TiÕn GV: Ph¹m TuÊn Anh M -S M M M -S M -S M -S 8^ M -S M X"+,N_M `%aM `a+,+.!M4b!3!M 3!3. " Y>O*F&:J"21!3 %&c4.,),!3+P# ,M 21%&c%&'">- >,N_HS8DhU0dK HUf2JK j 1 60 0 6cm D I C B A i( ∆ YOj$OTWf f ⇒ ∆ YO%a⇒YOTYTW3 ⇒Y-T KHNN 0 NW 0 N cm a == S Y>O TOY-TWN N TUI N H3 0 K >,0WHS8DhU0_KHd2JK 8 Y>ZOHY>OZK Y>T0N3kOZTS "+ TI0I3 0 DS Y>ZO TM 8 1 l"$S Y>O TI0I), Y>T0N ⇒Y>>TI0I ⇒>TI0I90NTNW ^/4 S Y>ZO T NW 0 NU0N  0 OZY>