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= 2 x 55
= 110 cm
sudut pusat = 2 x sudut keliling
= 2 x 40
= 80 cm
<BOC = 2 . <CAB
= 2 . 55*
= 110*
<ROQ = 180* - <ROS
= 180* - 40*
= 140*
<RPQ = . <ROQ
= . 140*
= 70*