tiet 59 luyen tap

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