Bulatan Dan Bahagian Bulatan

September 16, 2017 | Author: Imazuka Shitoru | Category: N/A
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Short Description

bulatan...

Description

BAB 10 : BULATAN

BAB 10 : BULATAN BULATAN DAN BAHAGIAN BULATAN

MENGIRA PANJANG LILITAN BULATAN Cari panjang lilitan bulatan jika diberi panjang jejari bulatan.  2×

O

× jejari

lilitan bulatan

pusat bulatan

lilitan bulatan = ?? cm

jejari = 7 cm jejari bulatan

perentas

diameter bulatan

tembereng major tembereng minor

lengkok minor

lengkok major

sektor minor sektor major

Contoh 1:

Contoh 2:

Cari panjang lilitan bulatan yang mempunyai jejari 7 cm.

Cari panjang lilitan bulatan yang mempunyai jejari 7 cm. ( )

(

)

Jawapan:

= 2×

Jawapan:

×7

= 44 cm #

= 2×

×7

= 43.988 cm #

BAB 10 : BULATAN

BAB 10 : BULATAN MENGIRA PANJANG LILITAN BULATAN

MENGIRA PANJANG LENGKOK BULATAN

Cari panjang lilitan bulatan jika diberi panjang diameter bulatan.

Cari panjang lengkok bulatan jika diberi jejari bulatan dan sudut



× diameter

 lengkok = ??

lilitan bulatan = ?? cm

60° jejari = 7 cm

diameter = 21 cm Contoh 1: Contoh 1:

Contoh 2:

Cari panjang lilitan bulatan yang mempunyai diameter 21 cm.

Cari panjang lilitan bulatan yang mempunyai diameter 21 cm. ( )

(

) Jawapan:

=

× 21

= 66 cm #

Jawapan:

=

× 21

= 65.982 cm #

Contoh 2:

Cari panjang lengkok bulatan yang Cari panjang lengkok bulatan yang mencangkum sudut 60° dengan jejari mencangkum sudut 60° dengan jejari 7 cm. 7 cm. ( ) ( ) Jawapan:

Jawapan:

=

×2×

=

cm #

×7

=



= 7.331 cm #

×7

BAB 10 : BULATAN

BAB 10 : BULATAN MENGIRA PANJANG LENGKOK BULATAN

MENGIRA LUAS BULATAN

Cari panjang lengkok bulatan jika diberi diameter bulatan dan sudut

Cari luas bulatan jika diberi jejari bulatan. 



× jejari²

lengkok = ?? luas bulatan = ?? cm

60° diameter bulatan = 21 cm

jejari = 7 cm

Contoh 1:

Contoh 2:

Contoh 1:

Contoh 2:

Cari panjang lengkok bulatan yang mencangkum sudut 60° dengan jejari 21 cm.

Cari panjang lengkok bulatan yang mencangkum sudut 60° dengan jejari 21 cm. ( )

Cari luas bulatan yang mempunyai jejari 7 cm.

Cari luas bulatan yang mempunyai jejari 7 cm. ( )

(

)

Jawapan:

Jawapan:

(

)

Jawapan:

Jawapan:

=

=

× 7²

= 154 cm # =

× 21

= 11 cm #

= = 10.997 cm #

× 7²

= 153.958 cm #

BAB 10 : BULATAN

BAB 10 : BULATAN MENGIRA LUAS BULATAN

MENGIRA LUAS SEKTOR BULATAN

Cari luas bulatan jika diberi diameter bulatan.

Cari luas sektor bulatan jika diberi jejari bulatan dan sudut

( )



(



)

luas sektor = ?? 60°

luas bulatan = ?? cm

jejari = 7 cm

diameter = 21 cm

Contoh 1: Contoh 1:

Contoh 2:

Cari luas bulatan yang mempunyai diameter 21 cm.

Cari luas bulatan yang mempunyai diameter 21 cm. ( )

(

)

Jawapan:

Contoh 2:

Cari luas sektor bulatan yang Cari luas sektor bulatan yang mencangkum sudut 60° dengan jejari mencangkum sudut 60° dengan jejari 7 cm. 7 cm. ( ) ( ) Jawapan:

Jawapan:

= 25.67 cm #

= 25.66 cm #

Jawapan:

( ) (

( ) )

= 346.5 cm #

(

)

= 346.4055 cm #

BAB 10 : BULATAN

BAB 10 : BULATAN MENGIRA LUAS SEKTOR BULATAN

MENCARI PANJANG JEJARI / DIAMETER JIKA DIBERI PANJANG LILITAN BULATAN

Cari luas sektor bulatan jika diberi diameter bulatan dan sudut ( ) 

(

Contoh :

)

lilitan bulatan = 44 cm

luas sektor = ?? 60°

jejari = ?? cm diameter= 7 cm diameter = ?? cm Cari panjang jejari bulatan jika diberi panjang lilitannya 44 cm (

Contoh 1:

Contoh 2:

Cari luas sektor bulatan yang mencangkum sudut 60° dengan jejari 21 cm.

Cari luas sektor bulatan yang mencangkum sudut 60° dengan jejari 21 cm. ( )

(

)

Jawapan:

)

Jawapan:

Jawapan:

( )

( ) (

= 57.75 cm #

)

( = 57.73 cm #

) * Jika soalan minta diameter, jejari × 2 Maka, diameter = 7 × 2 = 14 cm

BAB 10 : BULATAN

BAB 10 : BULATAN MENCARI PANJANG JEJARI / DIAMETER JIKA DIBERI LUAS BULATAN

Contoh :

CATATAN ....................................................................................................................................................................... ....................................................................................................................................................................... ....................................................................................................................................................................... .......................................................................................................................................................................

luas bulatan = 154 cm²

....................................................................................................................................................................... .......................................................................................................................................................................

jejari = ?? cm

....................................................................................................................................................................... .......................................................................................................................................................................

diameter = ?? cm

.......................................................................................................................................................................

Cari panjang jejari bulatan jika diberi luas bulatan itu 154 cm²

.......................................................................................................................................................................

(

.......................................................................................................................................................................

)

.......................................................................................................................................................................

Jawapan:

....................................................................................................................................................................... ....................................................................................................................................................................... ....................................................................................................................................................................... ....................................................................................................................................................................... ....................................................................................................................................................................... ....................................................................................................................................................................... .......................................................................................................................................................................



....................................................................................................................................................................... .......................................................................................................................................................................

* Jika soalan minta diameter, jejari × 2 Maka, diameter = 7 × 2 = 14 cm

....................................................................................................................................................................... ....................................................................................................................................................................... .......................................................................................................................................................................

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