Question

Tentukan diameter lingkaran jika diketahui luas lingkarannya
A. 5.544
B.30.184

Answer 1

Luas lingkaran = phi.r^2
5.544 = 22/7 x r^2
r^2 = 5.544 / 22/7
= 1.764
r = V1.764
= 42...diameter = 42+42 = 84

Answer 2

a) r^2 = 5544 x 7 / 22
         = 1764
     r = V1764
       = 42
   d = 84

b) r^2 = 30184 x 7 / 22
         = 9604
      r = V9604
         = 98
      d = 196