Nota Ringkas Matematik BULATAN

NOTA RINGKAS MATEMATIK : BULATAN (TINGKATAN 2)

BULATAN

Luas

 2 = 

Perimeter 2

2 = 

Kuasa dua sama ( kaedah nak buat perbezaan antara luas dan perimeter)

Tips apabila soalan nak sudut,jejari dan shaded area(common are a(common questions) in pt3 1. Kaedah nak kira area/perimeter bulatan dengan lebih mudah



×  2 /2 /2 

Contoh soalan: Diberi satu bulatan dengan jejarinya dengan jejarinya ialah 7 cm. o

Kira perimeter pada sudut 90  dalam bulatan itu.

PANDA CUTE@2015-maths f2 PT3

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Penyelesaian: =

90

360

22

  ×2 ×

×7

7

= 11 cm

2. Kaedah nak mencari sudut/jejari bagi perimeter/luas bulatan Gunakan formula ini: 

360

×  2 /2 /2  = luas l uas bulatan/perimeter bulatan

Contoh soalan: Diberi satu bulatan berjejari x  cm.  cm. Jumlah perimeter bagi sektor yang o

bersudut 90  ialah 11 cm. Cari nilai  x. Penyelesaian: 90 360

×2 ×

22

×  = 11

7 11 7



= 11

11  = 77

 = 7 cm

3. Shaded region

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1. Cari luas keseluruhan dahulu. 2. Cari luas bulatan yang tidak berlorek 3. Tolak hasil kedua-dua nilai tersebut.

- Good luck untuk peperiksaan PT3  –

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