Matematik F2: Bab 5 - Bulatan

Sifat
Bulatan





Sifat
Simetri
Perentas

=900 =900

lengkok



Jejari = OR = 13 cm
ON = OR – NM = 13 – 8 = 5 cm
RN= − = 12 cm

OP = OL

3 cm

Jejari = OP = OL=
ON= −
= cm = 7.94cm

9 cm
8 cm

OS= − = 6 cm RT≠ , ≠
OK= − = 4.36 cm
SOK =OS+OK = 6 + 4.36 = 10.36 cm

•Latihan Tambahan









Perimeter/Lilitan
Bulatan &

Panjang Lengkok
Bulatan

=

=

• ) = 14

• Lilitan =2 = 2 × 22 × 14 = 88
7

• i)d=14cm, j=14/2=7cm

Lilitan = = 22 × 14 = 44
7

• j=7cm, ∅=120 °

• P a ∅n j a°n×g Lengkok
= 2

= ° × 2 × 22 × 7
° 7

= 2


• Lilitan =2

• Panjang Lengkok ABC
(360°−120°=240°)

• = ∅ × 2
°

= ° × 2 × 22 × 42
° 7

= 176
Perimeter ABC+CD+DA
=176cm+42cm+42=260cm

• = •

• Panjang Lengkok minor PQ=9cm Major PQ
∅
9= ∅ × 2 = ° × 2
360°
° 22
9= ° × 2 × 7 ×

9=6 6 × , = °− ° × 2 × 22 ×41 7
° 7

9× 35 = =21cm

j=41 7 cm

Luas Bulatan
&

Luas Sektor
Bulatan



• )Luas = = 22 × 7 × 7
7

= 154 2

• b) d=2j, j=d/2=5 cm

Luas = = 22 × 5 × 5
7
4
= 78 7 2

Hitung luas sektor ABC. • = ∅ ×
°

= ° × × ×


=30

6j =6x14=84cm • = 616 2= 2
616 ×621726==272 2× 2
2j =2x14=28cm

j= 616 × 7
22

=14 cm

Luas ABCD –Luas 3 bulatan=

=(84 x 28)-3(616)
=504 2

• =
= 2 35 + 18 = 88

• Lilitan =2

2 × 22 × = 88
7
7
= 88 × 22×2 =14cm

• Luas =

= 22 × 14 × 14
7
=616

jb •= ∅ ° × jb − ∅ × ja
ja °

15 45cm ∅ (jb −ja )
cm °

= ×

= × × ( − )
°

=2310

•Latihan Tambahan



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