Jawapan

2015-08-09T21:40:23+08:00
[tex]A = ㅈ r^2
75.46 = (22/7)x(r^2)
  r^2 = 24
    r = 4.9 cm 
#  ㅈ = 22/7 
circumferen/perimeter/lilitan bulatan = 2ㅈ r
                          
P = 2ㅈr
   = 2 x (22/7) x (4.9)
   = 30.8 cm.