Jawapan

2016-08-18T20:49:44+08:00
Luas = 22/7 x j²
50/2/7 = 22/7 x j²
352/7 x 7/22 = j²
16 = j²
√16 = j
j = 4

diameter = 4 x 2
                 = 16
1 5 1