H×NH HäC 9 TIÕT : 59 KiÓm tra bµi cò : 1. Nªu c«ng thøc tÝnh Sxq h×nh trô. Ch÷a BT7 (SGK) 2. Nªu c«ng thøc tÝnh Vhtrô? Ch÷a BT8 (SGK) Gi¶i :   π  Bµi 7 !" #$%&'()'&*+  ,-%. /*+012+*+.13  -% 45245 03036761  " 2a a D A B C Gi¶i V = S.h 893:$  Bµi 8 !"  ;<=>?@9  8  π  3π A  ;<>4?@9  8  π"  30π A ⇒ 8  8  ⇒B4 A B B A C C¸ch 1 C¸ch 2 2a 2a a a a 2a II. LuyÖn tËpC Bµi 10 !"DEC "#$',1-2F *+A12+*+A13 "9?G'F*+H112+ *+I113 Gi¶i:Bµi 10 !" " #$',*+C   43A3AA71 "  "9*+C 83π  πH 3 I66πJI11 " >+<'K DL'K &%:'M')+K a) C ®¸y = 13cm; h = 3cm ⇒ Sxq = ? S xq = 2π Rh = C.h b) R = 5mm; h = 8mm ; V = ? V = S.h = πR 2 h Gi¶i:Bµi 11 !" 9N?@'NO'9:$ F*+.I1  2+I.H116.IH1 8.I36.IH6.II1 A " Bµi 11 !";'?G(1++1-?@' L2+1-*BP:/'3#$ *BP*+.I1  3;?Q'*B:R'*SI.H 113DL9,?@'*+SK >+<'K DL'K &%:'M')+K D :.I1  T I.H11⇒8 ?@' K 9)?@'O'8:$ FO'12,8 cm 2 .48,5mm" 83 Gi¶i bµi tËp14 !"3I663666*I661 A  ⇒#$,?G'U'P'*+J61 " ( ) 2 60 30 1800 . m h V ShSV ===⇒= Bµi tËp14 !"V-?G'U'U9'1- P'W11?QX%:/'.Y-:+ ,?G'U'*+A613#',?G'U'S*+ I66666*3  >+<'K DL'K &%:'M')+K DCA61T83I663666*   K 83 ;SM')C  T % T8  K C   43π  %   Z  πZπ  8  3π   #[:FC4\]?Q+^C H×nh nãn H×nh nãn côt DiÖn tÝch xung quanh vµ – – thÓ cña h×nh nãn h×nh nãn côt. Y,<_2+`'MU''_'^3 H×nh B/kÝnh ®6êng trßn ®¸y §/kÝnh ®6êng trßn ®¸y ChiÒu cao Chu vi ®¸y DiÖn tÝch ®¸y DiÖn tÝch xung quanh ThÓ tÝch 25 mm 7 cm 6 cm 1 cm 5 cm 1 * 15,7cm 5 cm 19,63 cm 2 137,38 cm 3 109,9 cm 2 3cm 18,84 cm 28,26 cm 2 1884 cm 2 2826 cm 3 10cm 12,74 cm 77,52 cm 2 400,04 cm 3 31,4 cm . H×NH HäC 9 TIÕT : 59 KiÓm tra bµi cò : 1. Nªu c«ng thøc tÝnh Sxq h×nh trô. Ch÷a BT7 (SGK) 2. Nªu c«ng thøc tÝnh