Jawapan

2016-08-22T19:42:25+08:00
Sudut/360 X 22/7 X 21 X 21 = 2772
sudut/360 X 1386 = 2772
sudut/360 = 1386/2772
sudut/360 = 0.5
sudut = 0.5 X 360
sudut = 180°

*tukar meter kepada sentimeter