Jawapan

2016-09-17T22:44:21+08:00
Sebentar ye, saya nak kira
2016-09-17T23:06:46+08:00
9(a) 2 x pi x 12
     =24 pi cm
     =12/24 x pi x 12 x 12
     =1/2 x 144
     =72 pie cm
    (b) sorry i dont know

10) cant help it