Jawapan

2015-10-17T08:36:20+08:00
Area - πr²
Circumference - 2
πr
Area of sector - x/360 * πr² (wherein x is the angle of your sector)
Circumference of sector - x/360 * 2πr (wherein x is the angle of your sector)

* = multiply
2015-10-17T11:08:32+08:00
Luas bulatan = pai j kuasa 2

lilitan bulatan = 2 pai j

pai = 22/7
j = jejari
contoh?
contoh;
cari luas dan lilitan bagi sebuah bulatan yang berjejari 7 cm

luas = pai j^2
luas = 22/7 X 7 X 7
luas = 154 cm persegi

lilitan = 2 pai j
lilitan = 2 X 22/7 X 7
lilitan = 44 cm