B A N G U N R U A N G S I S I L E N G K U N G created by ruhe
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BA N G U N R UA
N G
S I S I L E N G K
U N G
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TABUNG
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LUAS PERMUKAAN TABUNG
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LUAS SELIMUT TABUNG
2π r tDimana,
r = jari – jari tabung
t = tinggi tabung
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Lua e!imut tabun" # 2πrt
# 2 $ %,&' $ ( $ &)# (*+,' cm2
Pan jang jari- jari ala
s sebuah
tabung 9 cm dan tinggin ya
17 cm. Hitunglah luas selim
ut
tabung tersebut dengan π =
3,14
E $ a m -
! e &
. a / a b n y a
Pan jang jari- jari alas
sebuah
tabung 9 cm dan tinggin ya
17 cm. Hitunglah luas seli
mut
tabung tersebut dengan π =
3,14
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LUAS PERMUKAAN TABUNG
2πr2 0 2πrt
atau2 πr1r 0 t
Dimana,
r = jari – jari tabung
t = tinggi tabung
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a3Lua e!imut tabun" # 2 πrt &%2+# 2 $ 224) $ r $ &5
&%2+ # ''4) $ r $ &5 &%2+ # **+4) $ r
r # &%2+ 6 **+4) r # &%2+ $ )4**+
r # &'
. a / a b
E 7 AM P L E 2 T i ng g i s uat u t abung 1
c m d an l uas s el i mut n y a 1.3!" c m!. #eng an meng g una$ an ni l ai π # 22 4 ), hit un"!ah 6a. P an j ang j ar i - j ar i al as n y ab. %uas &er mu$
aan t abung
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L a n 8 u t a
nLua -ermu9aan tabun" # 2πr1r 0 t
# 2 $ 224) $ &' $ 1 &' 0 &5# $ 2(= !!
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Lua -ermu9aan tabun" tan-a tutu- # !ua a!a 0!ua e!imut)(&,2 # πr2 0 2 πrt)(&,2 # %,&' $*2 0 2 $ %,&' $ * $ t
)(&,2 # %,&' $ %* 0 %),*t)(&,2 : &&%,+' # %),*t*),2' # %),*tt # *),2'4 %),*
t # &
. a / a b
E 7 AM P L E %
P an j ang j ar i - j ar i al as s ebuah t abung t an &a
t ut u & ad al ah ' c m d an l uas &er mu$ aann y a 7 91 ,!( c m!. T ent u$ an t i ng g i t abung t er s ebut ) * π #%,&'
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KERUCUT
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LUAS PERMUKAAN KERU;UT
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Dimana,
R # 8ari<8ari a!a 9erucut
t # tin""i9erucut
πr
LUAS SELIMUT KERU;UT
Gari-e!u9
i
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LUAS PERMUKAAN KERU;UT
πr2 0 πr
atauπr1r 0
Dimana,
r = jari – jari $erucut
t = tinggi $erucut
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Pan8an" "ari -e!u9i dinyata9an den"an
a3 S2 # r2 0 t2 # %2 0 '2# ( 0
&* # 25 S # √25 # 5Lua e!imut 9erucut # π r s
=3,14 + 3 + !
E $ a m -
! e &
. a / a b n y a
Pan jang jari- jari alas
sebuah
$erucut 3 cm dan tinggin ya 4
cm. Hitunglah a. %uas
elimut
erucut
b. %uas Permu$aan erucut,
π = 3,14
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L a n 8 u t a
nLua -ermu9aan 9erucut# !ua e!imut 0 !ua a!a
= π rs . π r !
= 3, 14 + 3 + . 3,14 + 3 + 3= 47,1 . !(,!'=7,3' cm!
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BOLA
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LUAS PERMUKAAN B=LA
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'πr2
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Lua -ermu9aan b>!a# 'πr2
# ' $ 224) $ ) $ )# $ )
# *&* cm2
. a / a b
E 7 AM P L E &
P an j ang j ar i - j ar i s ebuah b/l a ad al ah 7 c m. T ent u$ an l uas &er mu$ aan b/l a t s b)
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L # 'πr2
&25* # ' $ %,&' $r2
&25* # &2,5* $ r2
r2 # &25*4&2,5*r2 # &++
r # &+
. a / a b
E 7 AM P L E 2
%uas &er mu$ aan s ebuah b/l a 1! ' c m!. H i t ung l ah &an j ang j ar i - j ar i b/l a t er s ebut d eng an π #%,&'
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0ajalin
?a! (<((
PGN>3 &, %, , (, &*
di 9erta e!embar
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πr2
t
@=LUME TABUNG
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@ # πr2t
))+ # 224) $ ) $ ) $ t))+ # 22 $ ) $ t&&+ # 22 $ t
t # &&+422 # 5 cm
. a / a b
E 7 AM P L E 2
ebuah t abung ber i s i 7 7 " c m3 at c ai r . P an j ang j ar i - j ar i al as t abung 7 c m. H i t ung l ah t i ng g i at c ai r i t u d eng an π =
!! 2 7
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πr2
t
@=LUME KERU;UT
Gari-e!u9
i
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@ # &4% πr2t
# &4% $ 224) $ )42 $ )42 $ &5# &(2,5 cm%
Pan jang jari- jari al
as sebuah
tabung 9 cm dan tinggin ya
17 cm. Hitunglah luas selim
ut
tabung tersebut dengan
π =
3,14
E $ a m -
! e &
. a / a b n y a
0ari- jari alas sebuah $erucut
= 3, cm dan tinggin ya 1
cm. 0i$a π = !! 2 7,
hitunglah
/lume $erucut tersebut)
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E
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@ # &4% $ πr2t'*2 # &4% $ 224) $ r2 $ (
'*2 # 224) $ r
2
$ %'*2 # **4) $ r2
r2 # '*2 $ )4**r2 # '(r # )
. a / a b
E 7 AM P L E 2
/l ume s uat u $ er uc ut 4' ! c m3. 0 i $ a t i ng g i $ er uc ut 9 c m d an π = !! 2 7 , hi t ung l ah &an j ang j ar i - j ar i al as $ er uc ut t er s ebut )
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