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=(135/360)(2)(22/7)(21)
=49,5 cm
keliling = panjang busur + jari jari + jari jari = 49,5 + 21 +21
=91,5 cm
=(135/360)(2)(22/7)(21)=49,5cm
keliling juring=panjang busur+jarijari+jarijari
49,5+21+21=91,5cm