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sudut pusat = 2 . sudut keliling
<SOR = 2 . <SQR
<SOR = 2 . 36°
= 72°
<SOP = 72° + 68°
= 140°
<SPO = <OSP , sehingga :
<SPO = (180° - <SOP) / 2
= (180° - 140°) / 2
= 40° / 2
= 20°